Projects

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This page maintains a list of academic, personal, and small non-commercial operating systems. For information regarding commercial or mainstream operating systems, please visit Wikipedia.

OSes have a high mortality rate: between 2004 and 2006, 112 of 213 OS Projects disappeared from the Internet. And looking at how often these projects are started by using the OS Project Announcement forum, in that same time period 68 projects were announced! The current total is 175 projects, but just 58 of them are active (as of January 1, 2018) and only 62 have been updated at least once since 2018 (three of which have been since abandoned), and 27 since 2019. Please help keep this list current by correcting it if you see any outdated information.

OSes without an update since 2015 are now located at Abandoned Projects.
More mature hobby operating systems can also be found at Notable Projects.
Particularly advanced and successful operating systems are listed at Advanced Projects.

Contents: 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

9

9front.png

9front

Plan9front (or 9front) is a fork of the Plan 9 from Bell Labs operating system. The project was started to remedy a perceived lack of devoted development resources inside Bell Labs, and has accumulated various fixes and improvements. Our homepage: http://9front.org/ , our artwork: http://9front.org/propaganda/

Icon phone.png http://lists.9front.org/

Icon license.png Open source

Icon site.png https://code.9front.org/hg/

Icon floppy.png ISO, ~500MB

Icon clock.png Latest update: 2024-05-27, is active


A

Access2.png

Acess2

Acess2 is a kernel and operating system designed to do what Linux does, be customizable to any given situation. However, unlike Linux, it there is no need to maintain backwards compatibility with anything. It features a simple but extensible VFS that currently supports VFAT and Ext2, IPv4/IPv6 networking with TCP/UDP, USB input, and storage. Recently, this project has been moved to GitHub, but its old git repo—with outdated sources and some useful documentation—can be found here: http://git.mutabah.net/?p=acess2.git;a=summary . v0.14 outdated floppy image is available at its' old page: username - root, password is blank. Could try building a new floppy from the latest sources by yourself! (some software rot has been noticed but its fixable)

Icon phone.png thePowersGang

Icon license.png Open source; inside the source code archive there are broken symlinks /Kernel/arch/x86_64/rme.c and /Kernel/arch/x86_64/rme.h to Real Mode Emulator files which are available here - https://github.com/thepowersgang/rme2

Icon site.png http://www.mutabah.net/acess2/

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Last commit: 2016-06-22, currently abandoned - the author has switched to his other project, Rust OS (https://github.com/thepowersgang/rust_os)


Amethyst-Screenshot.png

Amethyst

The goal, as much as there is one, is to produce an operating system vaguely similar to Windows 95/NT4 (if Windows 95 didn't inherit baggage from DOS and 3.1)..

Icon phone.png Jack Scott, jack [at] jackscott [dot] id [dot] au

Icon license.png Open source (ISC)

Icon site.png https://github.com/JackScottAU/Amethyst

Icon floppy.png ISO, ~1MB

Icon clock.png Latest update: 2024-06-24


Aros.jpg

Amiga Research Operating System

AROS aims to create a free open source AmigaOS like OS and make it better than the original. Our homepage: http://aros.sourceforge.net

Icon phone.png Ola Jensen, ola [at] aros [dot] org

Icon license.png Open source (MPL-like)

Icon site.png http://www.aros.org

Icon floppy.png Floppy, 1.44 MB ; ISO, ~200MB

Icon clock.png Latest update: 2024-05-28, is active


The Apollo Project

The Apollo project is a microkernel designed for maximum portability. Closely following the UNIX Philosophy without being unix itself. The Project has been active for about 6 years, with about 8 complete code rewrites along the way.

Icon phone.png allie [at] primis [dot] org

Icon license.png Open source (MIT)

Icon site.png https://github.com/primis/Apollo

Icon floppy.png ISO, ~10MB

Icon clock.png Latest commit: 2024-03-17, is active; Latest release: 2022-09-14


Aqeous

Aqeous is a new Completely-from-scratch, Not-a-UNIX 32 Bit pmode OS (basically a kernel right now), with SMP style Multi-Processor Support each using Multilevel Feedback Queuing Scheduling, Implementing its own FileSystem AqFS (also made a windows side AqFS Driver to communicate), Pretty good Shell, Pretty Neat VESA Graphics drivers, A Composting window GUI system with double buffering and Alpha-Blending, A primitive Scalable Font Rendering Engine and off-course mouse and keyboard drivers , Shell Scripting Support (like .bat in Windows) etc. Many things are in active development and its still not even in alpha. The Code may look pretty stupid but yeah that won't be that bad for long. The goal is to make something on which u can open facebook and send me a 'Hi' :) Currently It supports only Qemu :( But working on that too.

Icon phone.png ashishkmr472 [at] gmail [dot] com

Icon license.png Open source

Icon site.png https://github.com/AshishKumar4/Aqeous

Icon floppy.png IMG, >150MB

Icon clock.png Latest update: 2021-09-13


AQUA OS

AQUA OS is a 32 bit protected mode operation system, that has a nice organic and natural graphical interface. It is also very developer friendly, with loads of APIs.

Icon phone.png inobulles [at] gmail [dot] com

Icon license.png GPLv2

Icon site.png https://obiwac.wordpress.com/aqua-os/

Icon floppy.png ISO, ~20MB

Icon clock.png Latest update: 2018-04-09


AquilaOS.png

AquilaOS

AquilaOS is a UNIX-like operating system, intended to be fully POSIX-compliant. Its design follows a generic and robust approach. Many POSIX interfaces are already supported including multi-threading, and many POSIX compliant applications have been ported.

Icon phone.png manwar [at] ieee [dot] org

Icon license.png Open Source (GNU GPLv3)

Icon site.png http://aquilaos.com

Icon floppy.png ISO, ~10MB

Icon clock.png Latest update: 2019-10-26


AsuroTUIWindows.png

Asuro

Asuro is an x86 Operating System that started development in 2015 as somewhat of an academic project. Written almost entirely in Freepascal, with NASM used only for bootstrapping & minimal low-level routines, Asuro is a purely hobbyist operating system that differs quite majorly in design from any mainstream OS by using a VM/SE to run anything other than kernel code.

Icon phone.png Kieron Morris, kjm [at] kieronmorris [dot] me
Icon phone.png Aaron Hance, ah [at] aaronhance [dot] me

Icon license.png Open Source

Icon site.png https://www.spexeah.com/index.php/asuro/

Icon floppy.png ISO, ~5MB

Icon clock.png Latest commit: 2022-02-07


AstralFvwm3.png

Astral

Astral is a 64 bit operating system written in C which aims be compatible with POSIX. It has a growing support for networking and is able to run from disk with support for caching pages. Currently ported software ranges from Bash and GCC to X.org, Fvwm3, xterm and Quake.

Icon phone.png No Contact Information

Icon license.png Open source (MIT)

Icon site.png https://github.com/Mathewnd/Astral

Icon floppy.png ISO, ~140MB-750MB

Icon clock.png Latest commit: 2024-05-28, is active


Aura

Aura is part of a larger idea, Project Asiago. It's goal is to reinvent all the currently outdated systems in one unified setup. Aura is just the kernel part of this.

Icon phone.png Chris Smith, chris [at] hichris.com

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/projectasiago/aura

Icon floppy.png IMG, ~400MB

Icon clock.png Latest commit: 2018-03-09


AwooOS

awooOS is an experimental, monotasking operating system, bringing together old ideas and new technology. It is designed around a microkernel, with as much moved into libraries as possible. The kernel proper is less than 50 lines of code.

Icon phone.png Ellen Dash, me [at] duckie [dot] co

Icon license.png Open source (MPL)

Icon site.png https://github.com/awooos/awooos

Icon floppy.png IMG, ~2MB

Icon clock.png Latest commit: 2019-02-16


Xeneva2024March 5.png

aurora-xeneva

aurora-xeneva is a multitasking GUI based operating system targeting x86_64 & aarch64 architecture, focusing most modern hardwares as possible. "Aurora" being the name of kernel and "Xeneva" is the name of entire operating system. Aurora kernel features SMP, Networking, HD-Audio,USB3,Graphical Drivers,..many more.

Icon phone.png Manas Kamal, manaskamal.kandupur [at] gmail [dot] com

Icon license.png Open source (BSD 2-Clause)

Icon site.png https://github.com/manaskamal/XenevaOS

Icon floppy.png IMG, ~1GB

Icon clock.png Latest commit: 2024-03-27, is active


B

Banana os 2.jpg

Banana

Banana is a 32-bit OS written in C and C++, designed for a 486 or better with at least 16MB of RAM. The kernel is pre-emptive and supports loading ELF drivers and modules from the disk. It runs on real hardware, and supports ATA/ATAPI/SATA/SATAPI/floppy disks, FAT/exFAT/ISO9660 filesystems, PS/2 keyboard and mouse, SB16 and AC97 audio. Banana also has ACPI support. It comes with an installer which can be run from floppies or a CD-ROM. Currently has a command line shell, and a GUI with solitaire, minesweeper, a photo viewer and text editor.

Icon phone.png Alex Boxall, alexboxall3 [at] gmail [dot] com

Icon license.png Creative Commons Attribution-NonCommercial 4.0 - https://creativecommons.org/licenses/by-nc/4.0/

Icon site.png https://github.com/A22347/Banana-Operating-System

Icon floppy.png IMG, ~64MB

Icon clock.png Latest commit: 2022-11-13


BareMetal

BareMetal is a 64-bit OS for x86-64 based computers. The OS is written entirely in Assembly while applications can be written in Assembly or C/C++. The two main purposes of BareMetal are for educational uses in learning low-level OS programming in 64-bit Assembly and to be used as a base for a high-speed data processing node. Source code is well documented and freely available. As of version 0.4.9 BareMetal OS officially supports multiple processors, memory management, and Ethernet communications. More information here - http://www.returninfinity.com/

Icon phone.png Ian Seyler, ian.seyler [at] returninfinity [dot] com

Icon license.png Open source

Icon site.png https://github.com/ReturnInfinity/BareMetal-OS

Icon floppy.png IMG, >128MB

Icon clock.png Latest commit: 2024-05-27


BCOS

BCOS is a practical distributed operating system, initially aimed at 80x86/PC compatible computers. In general BCOS is meant to (eventually) make a group of computers connected by a network (a cluster of computers) behave like a single computer with multiple users.

Icon phone.png Brendan Trotter, btrotter [at] gmail [dot] com

Icon license.png Proprietary :(

Icon site.png http://bcos.hopto.org/

Icon floppy.png Unknown

Icon clock.png Latest update: 2019-06-15


Beelz 3.png

Beelzebub

Beelzebub (The Lord of Flies) features a hybrid kernel, accompanied by libraries and apps written mainly in C++, serving as a platform for development and experimentation of kernel/OS/runtime features. It currently targets AMD64, with plans to support IA-32 and ARM architectures later. It aims to become a clean, modern, and efficient operating system for servers and workstations.

Icon phone.png contact [at] vercas [dot] com

Icon license.png Open source (BSD-like)

Icon site.png https://github.com/vercas/Beelzebub

Icon floppy.png Floppy, 1.44 MB (will be available soon)

Icon clock.png Latest commit: 2021-06-06


BeeOS

A simple "Unix-like" x86 kernel trying to be POSIX compliant. Currently, the project does not have any long term mighty ambition, it just want to be a good learning tool for operating systems and low level programming topics. A future "on-the-field" usage, especially when ARM port will be ready, is not excluded.

Icon phone.png davxy [at] datawok [dot] net

Icon license.png Open source (GNU LGPLv3)

Icon site.png https://github.com/davxy/beeos

Icon floppy.png Floppy, 1.44 MB (will be available soon)

Icon clock.png Latest commit: 2023-05-29, is active


Bleskos 2023.png

BleskOS

BleskOS is 32-bit operating system written from scratch in C. One of main features is alternative graphic user interface that do not use windows, as classic operating systems do, but switches between programs on full screen. BleskOS is designed for older computers. Goal of BleskOS is to provide system, that could be installed on older computers to make them usable again. BleskOS have wide range of drivers such as VBE, AC97, Intel HD Audio, PS/2 keyboard, PS/2 mouse, PATA(PI), SATA(PI), USB controllers UHCI/OHCI/EHCI, FAT filesystems, ethernet cards from Realtek, Intel, AMD and more. BleskOS also supports widely used file formats like JPG, PNG, GIF, MP3, TXT, HTML and more. Every version is tested on multiple real computers.

Icon phone.png [email protected]

Icon license.png Open source (MIT)

Icon site.png https://github.com/VendelinSlezak/BleskOS

Icon floppy.png Floppy, 1.44 MB ; ISO, ~2MB

Icon clock.png Latest commit: 2024-05-25, is active


BlueKernel

The BlueKernel is a simple microkernel design intended for students. It has pre-emptive multitasking with threads, message-passing and virtual memory. It is currently targeted for the IA-32 processors, but the design is strictly separated into a hardware-dependent mechanisms layer, with an independent policy layer on top of that. It has its own basic boot loader that loads the kernel and a disk driver. It also has a basic text-mode display driver and keyboard driver. As with most microkernels, the drivers run in user space and help to demonstrate message passing and interrupts. When the system starts it loads a server that allows the user to load their own processes. There are very simple example user programs to demonstrate threads, message-passing and interrupts. The website is written like a textbook to explain how it all works, focusing on the implementation rather than theory.

Icon phone.png http://bluekernel.com.au/#intro,Download%20+%20Contact

Icon license.png Creative Commons, http://creativecommons.org/licenses/by-nc-nd/4.0/

Icon site.png http://www.bluekernel.com.au

Icon floppy.png Floppy, 1.44 MB (at ./makefile change 20160 to 2880)

Icon clock.png Latest update: 2018-12-15


BoneOS

BoneOS is an Operating System for everyone built by everyone. The goal is to make an Operating System for 'Everyone'. Ranging from Programmers to Normal Users. This operating system currently supports x86 and x64. Later will move forward to other architectures and platforms such as MIPS, PowerPC, ARM, etc...

Icon phone.png Bone OS Team (https://github.com/Bone-Project/BoneOS)

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/Bone-Project/BoneOS

Icon floppy.png IMG, ~10MB

Icon clock.png Latest commit: 2023-11-20, is active



BrutalDemo.png

Brutal

An operating system inspired by brutalist design that combines the ideals of UNIX from the 1970s with modern technology and engineering. Brutal is a microkernel written in modern C that targets x86-64 and RISCV (WIP). Brutal has: its own UEFI bootloader, a WIP C compiler, an IDL, a GUI, and much more... If you want a 'complete' list of work in progress or implemented features you can take a look at the roadmap: https://github.com/brutal-org/brutal/blob/main/meta/roadmap.md

Icon phone.png Brutal discord server: (https://discord.com/invite/gamGsfg)

Icon license.png Open source (MIT) source code available at: https://github.com/brutal-org/brutal

Icon site.png https://brutal.smnx.sh/

Icon floppy.png Floppy, 1.44 MB (will be available soon)

Icon clock.png Latest commit: 2023-08-21, is active


BoxOS

A simple, Unix-like operating system written in C and GAS assembly. Under heavy development as it cannot switch to Ring-3 as of writing. Major goals include porting many Linux applications and becoming an alternative Unix-like OS to Linux and the BSDs.

Icon phone.png mailing list: [email protected], personal: [email protected]

Icon license.png Open Source (GPLv2)

Icon site.png https://git.gymli.org/dholman/box.git

Icon floppy.png IMG, expected to be between 1GB and 2.5GB with a complete userspace

Icon clock.png Last tag: 2024-05-29, is active


C

ChaiOS sine.png

ChaiOS

Modular multi-platform OS. Even Kernel C library dynamically linked (using very basic duplicates). Written in Visual C++ and NASM.

Icon phone.png solocle: chaios.project [at] gmail [dot] com, personal: bellezzasolo [at] gmail [dot] com

Icon license.png Open source (MIT)

Icon site.png https://github.com/ChaiSoft/ChaiOS

Icon floppy.png IMG, >20MB

Icon clock.png Last commit: 2023-04-27


Cloudium OS

This is being written in pure ASM with cloud computing in mind. Exploring the new exokernel designs and basin design decisions only on speed and cloud. Our homepage: https://sourceforge.net/projects/cloudium-os/

Icon phone.png 0xjarno [at] gmail [dot] com

Icon license.png Proprietary :(

Icon site.png https://sourceforge.net/projects/cloudium-os/

Icon floppy.png IMG, 2KB

Icon clock.png Latest update: 2017-09-15


Cthulhu OS

Cthulhu OS is actively developed x86-64 based microkernel which uses C11 and custom libc. Currently supports simple user space code. Long term goals include standard desktop operating system. Cthulhu OS supports creating processes from initramfs (called rlyeh) and memory + syscall management. Sadly it has a horrible toolchain and is very difficult (if not impossible) to compile in the up-to-date development environment, unless the author of this project fixes it

Icon phone.png Peter Vanusanik, admin [at] en-circle [dot] com

Icon license.png Open source (MIT)

Icon site.png http://enerccio.github.io/Cthulhu-OS/

Icon floppy.png Floppy, 1.44 MB (download unavailable)

Icon clock.png Last commit: 2016-01-31


CatK

CatK is a kernel taking inspiration from FreeBSD and similar Unix-like systems written almost completely in C.

Icon phone.png No Contact Information

Icon license.png Open Source (GNU GPLv3)

Icon site.png https://github.com/Rodmatronic/CatK/tree/un-shitified

Icon floppy.png IMG, ~2MB (download unavailable)

Icon clock.png Last commit: 2024-08-01


D

Dawn.png

Dawn

Dawn OS is a high-level operating system for the SUBLEQ instruction set. It supports SMP, 64 bit memory addressing, multitasking, it has a built-in C compiler, virtual keyboard, and its' own P2P network standard with automatic forwarding beetween clients, and contains various built-in tools like paint, text editor, sound player, chess, piano, amoeba

Icon phone.png http://users.atw.hu/gerigeri/DawnOS/download.html

Icon license.png Proprietary :(

Icon site.png http://users.atw.hu/gerigeri/DawnOS/index.html

Icon floppy.png IMG, ~640MB

Icon clock.png Latest release: 2020-07-06


Dennix

Dennix is a unix-like operating system for x86 and x86_64 written in C and C++. It consists of a monolithic kernel, a standard C library, userspace applications and a graphical user interface. It also comes with several ports of third-party software.

Icon phone.png https://github.com/dennis95/dennix

Icon license.png Open source (ISC)

Icon site.png https://github.com/dennis95/dennix

Icon floppy.png ISO, ~64MB

Icon clock.png Latest commit: 2023-08-12, is active


Diyos.png

DiyOS

A learn-by-doing OS with a basic GUI.

Icon phone.png Leonardo Monteiro (leonardoms1911 AT gmail.com)

Icon license.png GPL-3.0

Icon site.png https://github.com/leonardoms/DiyOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2022-01-29


DreamOs

Home-made operating system, developed in C and asm for x86 architectures.

Icon phone.png Ivan Gualandri, contact info at the bottom of Github page

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/inuyasha82/DreamOs

Icon floppy.png Unknown

Icon clock.png Latest commit: 2024-01-09, is active


DreamOs64

Home-made 64 bit operating system, developed in C and asm from scratch

Icon phone.png Ivan Gualandri, contact info at the bottom of Github page

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/dreamos82/DreamOs64

Icon floppy.png Unknown

Icon clock.png Latest commit: 2024-05-26, is active


DuckOS.png

duckOS

An x86 monolithic kernel and operating system written in modern C++. Comes with a completely in-house kernel, window manager & compositor, graphical applications, and command-line utilities. It also has ports of binutils and gcc.

Icon phone.png byteduck, contact info on GitHub

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/byteduck/duckOS

Icon floppy.png IMG, ~120MB

Icon clock.png Latest commit: 2024-04-20, is active


Dux

An x86 operating system with module loading capabilities, started in 2008

Icon phone.png Ellen Dash, me [at] duckie [dot] co

Icon license.png Open source (MIT)

Icon site.png https://github.com/duckinator/dux

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2017-12-05


E

Escape

Escape is a 32-Bit microkernel operating system for X86 that supports multitasking and multithreading. It's implemented in ANSI C, C++ and a bit assembler and most parts of it are UNIX-like. The goal is to experiment with it and learn as much as possible about operating systems, hardware and so on.

Icon phone.png Nils Asmussen, nils [at] script-solution [dot] de

Icon license.png Open source (GNU GPLv2)

Icon site.png https://github.com/Nils-TUD/Escape

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2023-07-24


Einherjar

Forth computing environment for PowerPC Macs.

Icon phone.png Konstantin Tcholokachvili, konstantin [dot] tcholokachvili [at] protonmail [dot] com

Icon license.png Open source (MIT)

Icon site.png https://github.com/narke/Einherjar

Icon floppy.png ISO, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2020-03-16


ExectOS

ExectOS is a modern, EFI-enabled, general purpose operating system written from scratch and implementing the XT architecture. It runs on x86 and x86_64 architectures and provides NT drivers compatibility layer. Currently, it is in the pre-alpha state.

Icon phone.png Rafal Kupiec, belliash [at] codingworkshop [dot] eu [dot] org

Icon license.png Open source (GNU GPLv3)

Icon site.png https://git.codingworkshop.eu.org/xt-sys/exectos

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest update: 2024-05-27, is active


F

Fiwix

Fiwix is an operating system kernel written from scratch, based on the UNIX architecture and fully focused on being POSIX compatible. It is designed and developed mainly as a hobby OS and, since it serves also for educational purposes, the kernel code is kept as simple as possible for the benefit of students and OS enthusiasts. It is small in size (less than 50K lines of code), runs on the i386 hardware platform and is compatible with a good base of existing GNU applications. A special floppy image with RAMdisk support is available.

Icon phone.png Jordi Sanfeliu, jordi [at] fibranet [dot] cat

Icon license.png Open source (MIT)

Icon site.png https://www.fiwix.org/

Icon floppy.png Floppy, 1.44 MB ; IMG, ~230MB; ISO, ~570MB

Icon clock.png Latest release: 2023-11-15, is active


Fling OS

Fling OS is an educational operating system with full technical documentation and aiming to have full reference and tutorial articles on every aspect of its code. As of September 2015, they had a C# kernel with ELF driver and USB 2.0 support for x86, a C# AOT compiler, and a cross-platform (x86/MIPS) compiler verification kernel. They launched over 30 articles and a series of 10 Getting Started tutorial videos on 17th September 2015 having been sponsored by Imagination Technologies over the previous summer. Stable core kernel including USB 2.0 and ELF drivers. Also first release of their AOT C# to x86/MIPS compiler and compiler verification kernel. Industry sponsored and collaborating with University Of Bristol. Our homepage: http://www.flingos.co.uk

Icon phone.png Edward Nutting , osdev [at] flingos.co.uk

Icon license.png Open source (GNU GPLv2)

Icon site.png https://github.com/FlingOS/FlingOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2017-10-30


FoxOS.png

FoxOS

FoxOS's goal is to develop an operation system that focuses on the terminal, performence and reliability. And hope to provide users with a functionnal, performant and stable OS.

Icon phone.png No Contact Information

Icon license.png Open source (MIT)

Icon site.png https://theultimatefoxos.github.io/

Icon floppy.png IMG, 60-100MB

Icon clock.png Active


Desktop

Foton

A simple, clean code, multi-tasking kernel written in C language for 64-bit processors from the AMD64 family.

Foton (workname) is a hobby operating system based mostly on NOTHING. Lazy development begin at first day of year 2013 and Assembly language was choosen as first one.

Icon phone.png CorruptedByCPU at Discord [1]

Icon license.png Private

Icon site.png https://github.com/CorruptedByCPU/Foton

Icon floppy.png ISO, 2,3 MiB https://blackdev.org/files/foton.iso

Icon clock.png Latest commit: 2024-12-01, is active


FreeDOS.png

FreeDOS

Today, FreeDOS is ideal for anyone who wants to bundle a version of DOS without having to pay a royalty for use of DOS. FreeDOS will also work on old hardware and embedded systems. FreeDOS is also an invaluable resource for people who would like to develop their own operating system. While there are many free operating systems out there, no other free DOS-compatible operating system exists. Sources are here: http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/repositories/1.3/

Icon phone.png Jim Hall, the mailing lists at http://www.freedos.org/lists/

Icon license.png Open source (GNU GPLv2)

Icon site.png http://www.freedos.org

Icon floppy.png Floppy, 1.44 MB ; IMG, 32MB

Icon clock.png Latest commit: 2024-05-29, is active


FROST

FROST is an OS written in FreeBASIC based on the FROST-Microkernel. Basic kernel functionality available, IPC, VFS and SMP in development

Icon phone.png https://github.com/thrimbor/frost

Icon license.png Open source

Icon site.png https://github.com/thrimbor/frost

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2018-04-12


Fudge

Fudge started as a project to see if it would be possible to create an operating system that came as close as possible to be fully deterministic by not implementing solutions with unpredictable behaviour like dynamic memory allocation, scheduling and caching.

Icon phone.png Jens Nyberg, jens [dot] nyberg [at] gmail [dot] com

Icon license.png Open source (MIT)

Icon site.png http://github.com/jezze/fudge/

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-05-13, is active


FuzzyOS.gif

FuzzyOS

32-bit x86 multiprocessing OS capable of running console or graphical user applications. The bootloader and kernel are written in NASM/C, the STL and user applications are written C/C++, while the tests are written in bash and python. It's built as a hobby project for educational purposes.

Icon phone.png https://github.com/scopeInfinity/FuzzyOS

Icon license.png Open source (Apache 2.0)

Icon site.png https://github.com/scopeInfinity/FuzzyOS

Icon floppy.png Floppy, 1.44 MB (will be available soon) ; IMG, 1 MB

Icon clock.png Latest commit: 2021-10-25


Latest gui.png

FYSOS

Intel/AMD 32-bit and 64-bit operating system, including most modern hardware specifically the USB and related hardware.

Icon phone.png Ben Lunt, fys [at] fysnet [dot] net

Icon license.png Proprietary :(

Icon site.png http://www.fysnet.net/fysos.htm

Icon floppy.png Floppy, 1.44 MB ; IMG, 9 MB

Icon clock.png Latest update: 2022-04-18, is active


G

Ghost-ui-preview.png

Ghost OS

A homemade operating system with a microkernel for the IA32 (x86) platform. The project is written in C++ and Assembly. Features: multiprocessor- & multitasking support, kernel API library, custom C library, ELF support, IPC (messages, signals, shared memory, pipes), VFS, window server & GUI with homemade toolkit, PS/2 keyboard & mouse driver, VESA video driver and more...

Icon phone.png Max Schlüssel, lokoxe [at] gmail [dot] com

Icon license.png Open source (GNU GPLv3)

Icon site.png http://ghostkernel.org/

Icon floppy.png ISO, ~70MB

Icon clock.png Latest release: 2023-08-17, is active


Gubernatrix

A 64-bit single-address space, containerizing operating system.

Icon phone.png himanshu.goel2797 [at] gmail [dot] com

Icon license.png Open source (MIT)

Icon site.png https://gitlab.com/hgoel0974/gubernatrix

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2019-10-15


GreenteaOS-preview.jpg

GreenteaOS

Greentea OS is a 64-bit desktop OS for x86-64 and also potentially promising platforms like ARM64 and RISC-V. Aims to run .exe files natively and NT drivers under sandbox compatibility layer. Follows own non-NT/non-UNIX modular kernel design called Tofita Engine. Developed completely in a custom programming language Hexa tuned for the purposes of the OS. Currently in the pre-alpha state.

Icon phone.png unstubborn [at] proton [dot] me

Icon license.png Open source (GNU LGPLv3)

Icon site.png https://github.com/GreenteaOS

Icon floppy.png ISO, ~50MB

Icon clock.png Latest commit: 2024-05-26, is active


H

Haiku.png

Haiku

Fully featured open source operating system inspired by the commercial Be Operating System. Has a preemptive, modular kernel, nearly complete POSIX compatibility, a nice (non-X11-based) GUI, and a wide variety of ported and native applications (including a WebKit based browser). Nearly the entire operating system is written in C++98 (including the kernel), albeit with little usage of exceptions.

Icon phone.png haiku-development [at] freelists.org

Icon license.png Open source (MIT)

Icon site.png https://www.haiku-os.org/

Icon floppy.png ISO, 1.4GB

Icon clock.png Latest commit: 2024-05-29, is active


HelenOS.png

HelenOS

Preemptive microkernel multiserver design, SMP support, lightweight IPC, thread-local storage and user-space managed fibrils. Our homepage: http://www.helenos.org/

Icon phone.png helenos-devel [at] lists [dot] modry [dot] cz

Icon license.png Open source (BSD/GPL)

Icon site.png https://github.com/HelenOS/helenos

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Last commit: 2024-05-21, is active


HeliX

HeliX is a german open-source OS. It has a nice shell and already supports FAT12, multitasking, keyboards and mice and very, very much more... HeliX is still in development and it doesn't exist a long time , so there are many features to come! [at] this point of time there are no downloads at the webpage, because there are still some heavy bugs (; -please be patient; they'll come!

Icon phone.png Illusoft, Ufo [at] sandrakoenig [dot] de

Icon license.png Open source (BSD 2-clause)

Icon site.png https://github.com/Helix-OS/helix-os

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Last commit: 2016-01-15, is abandoned


HhuOS-logo.png

hhuOS

hhuOS is a small operating system for the x86-architecture, build for teaching purposes. The main goal of this project is to show, how different aspects of operating systems theory can be implemented and linked together. The system is not aimed to be a fully featured operating system for daily use. It is implemented in C++ with small parts of assembly where needed.

Icon phone.png ruhland [at] hhu [dot] de

Icon license.png Open source (GPLv3)

Icon site.png https://github.com/hhuOS/hhuOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-05-27, is active


Hoho

Hoho is an x86 open-source OS supporting multitasking with ELF executables, virtual memory, FAT and virtual filesystem, ATA drives and Floppy disks. Soon it will be self hosted with GCC working on top of it.

Icon phone.png David, kingbabasula [at] gmail [dot] com

Icon license.png Open source (Apache 2.0)

Icon site.png https://github.com/davidepianca98/hoho-os

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Last commit: 2016-11-12, likely abandoned


Hydrogen

Hydrogen is an operating system targeting embedded systems (servers, thin clients, SBCs) running on x86. Its written in C and assembly (NASM). There is no support for VGA, its serial-only. My homepage: https://github.com/moondeck/hydrogen/commits/master/

Icon phone.png moondeck, olgierd [at] novakovsky [dot] eu

Icon license.png Open source (Apache 2.0)

Icon site.png https://github.com/moondeck/hydrogen/commits/master/

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2017-06-01


Hypnoticos-screenshot.png

HypnoticOS

64-bit Hobby Operating System

Icon phone.png https://github.com/hypnoticos/hypnoticos

Icon license.png GNU GPLv3

Icon site.png https://github.com/hypnoticos/hypnoticos

Icon floppy.png ISO, 16 MB

Icon clock.png Last commit: 2024-07-13


I

Gloire.png

Ironclad

Ironclad is a mostly formally verified hard real-time kernel written in SPARK and Ada. It is made to be 100% free software, free in the sense that it respects the user's freedom. It supports several architectures and features an advanced security model with features like Mandatory Access Control (MAC). The screenshot features Gloire, a distribution of Ironclad.

Icon phone.png [email protected]

Icon license.png GNU GPLv3

Icon site.png https://ironclad.cx

Icon floppy.png IMG, 1 GB (given for a Gloire)

Icon clock.png Latest commit: 2024-05-28, is active


J

JaeOS

Just Another Embedded OS. My homepage: http://jaeos.com/

Icon phone.png http://jaeos.com/contact-us.html

Icon license.png Open source (MIT)

Icon site.png https://github.com/azsoter/jaeos-devel

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2020-11-05


Jsdos-1.gif

JSD/OS

JSD/OS which either stands for "Jake S. Del Mastro Operating System" or "Jake'S Disk Operating System" is a tiny Pseudo Single-Tasking operating system for 32bit x86, developed on and off since 2014. The goal is to build an OS with a very small memory footprint, a fast file system and minimal overhead to allow user requests to be processed as quickly as possible, ideal for interactive applications, using a unique scheduler known as CuFS (Conciously unFair Scheduling). The system can run applications packaged in the ELF object format and has full support for memory protection via virtual address spaces. The system includes a shell which works with many DOS & Unix commands.

Icon phone.png https://jakedelmastro.com/contact/

Icon license.png Open source (BSD 3-Clause)

Icon site.png https://github.com/pgrAm/JSD-OS

Icon floppy.png Floppy, 1.44 MB (will be available soon) ; IMG, 2 MB

Icon clock.png Latest commit: 2022-07-23


JSLK

JSLK is a 32-bit hobby kernel designed to run on the x86 architecture (although portability has been taken into consideration). It was started in August 2017 with the objective of learning how a computer operating system works and to improve the coding skills of the main developer. The kernel is mostly written in C with some bits of assembly and has partial compatibility with C++ (a runtime is provided). Some of its features are: extensive HAL API, System V ABI compatibility, memory management, interrupt handling, VGA driver, timers and delays, some synchronization primitives, a growing home-made C library, virtual memory, a VFS, a keyboard and RTC driver and more. Website: https://sofferjacob.github.io/jslk.html

Icon phone.png Jacobo Soffer, sofferjacob [at] gmail [dot] com

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/sofferjacob/jslk

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Last commit: 2018-12-21


K

Klika os.png

KLIKA-OS

Simple x86_64 multi tasking OS with GUI. Features preemptive multitasking, memory management, userspace, FAT 12/14/16, GUI with VESA, etc. Written in C and assembly.

Icon phone.png Zaharije Pasalic, zaharije [at] klika [dot] ba

Icon license.png Open source

Icon site.png https://github.com/klikaba/klika-os

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2020-02-22



KnightOS

Open-source operating system for Texas Instruments calculators. Features preemptive multitasking, memory management, etc. Written in z80 assembly. Mature SDK, usable kernel, usable userspace, no math. Our homepage: http://knightos.org

Icon phone.png Drew DeVault, sir [at] cmpwn [dot] com

Icon license.png Open source (Beerware)

Icon site.png https://github.com/KnightOS/KnightOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2021-05-02


KolibriOS.png

Kolibri OS

Kolibri OS was a fork of the 32-bit version of Menuet OS but has changed much along the way. Despite fitting on a standard 1.44 MB floppy, this wonderful OS contains: the complete GUI desktop, a lot of drivers and great software (such as web browser and music player), system programs and games! The Kernel and most applications, libraries and drivers are written in FASM, but some are in C-- (https://en.wikipedia.org/wiki/C-- ; link to their C-- compiler: http://c--sphinx.narod.ru/). At this OS you can write the ASM code and execute it after assembling. Source code is open - http://websvn.kolibrios.org/listing.php?repname=Kolibri+OS - and the contributions are welcome!

Icon phone.png The Kolibri OS team

Icon license.png Open source (GNU GPLv2)

Icon site.png http://www.kolibrios.org/en/

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Latest commit: 2024-05-29, is active


Kora OS

Kora is an operating system under it's way. The OS is still a young pup develop by an enthusiast engineer as a learning project.

Icon phone.png Fabien Bavent ([email protected])

Icon license.png Open source (GNU AGPL)

Icon site.png https://github.com/AxFab/kora-kernel

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2023-05-11, is active



KOS

KOS is a Hobby Operating System. It is meant to be minimalist and easy to understand.

Icon phone.png Karthik Kumar Viswanathan ([email protected])

Icon license.png Open source (Standard Disclaimer)

Icon site.png https://github.com/guilt/KOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2019-07-29


L

Lambda OS

Lambda OS is a hobby operating system developed by Peter Farley. Lambda OS is designed to work on any i386-compatible processor, but its' design allows for easier addition of new architectures without any major modification of the main kernel code

Icon phone.png Peter Farley, far.peter1 [at] gmail [dot] com

Icon license.png Open source (MIT)

Icon site.png https://github.com/farlepet/lambda-os

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2022-08-30, is active


LaylaOS.png

LaylaOS

LaylaOS is a hobby operating system with a monolithic kernel that is written in C. It has many features including networking, ATA/ATAPI, AHCI, Intel HDA, virtual consoles, vdso, IPC, demand paging, and ACPI (ACPICA). Ported software includes SDL2, Qt5, musl and more

Icon phone.png Mohammed Isam, mohammed_isam1984 [at] yahoo [dot] com

Icon license.png Open source (GPL2)

Icon site.png https://github.com/moisam/laylaos

Icon floppy.png IMG, 3.0 GB

Icon clock.png Latest commit: 2024-09-08, is active


LemonOS.png

Lemon OS

Lemon OS is a UNIX-like 64-bit operating system written in C++. It features various software ports such as DOOM, networking (TCP/UDP), and various drivers including AHCI and NVMe.

Icon phone.png No Contact Information

Icon license.png Open source (BSD 2-clause)

Icon site.png https://github.com/LemonOSProject/LemonOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2023-11-04, is active


LF OS kernel initialization in QEMU

LF OS

Microkernel based operating system for amd64 with high ambitions. Work primarily happens on a gitlab instance (complete with CI/CD system), but the master branch is also mirrored to github for convenience. Check out the repo if you want to know more, changes are happening too fast to update everywhere x)

Icon phone.png CONTRIBUTING.md

Icon license.png Open source (MIT)

Icon site.png https://github.com/LittleFox94/lf-os_amd64

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-05-29, is active


M

Managarm-demo.png

Managarm

Managarm is a 64-bit OS for x86-64. It’s written in C++ with a custom libc and a GNU like userland on top. Managarm’s main purpose is aiming for Linux compatibility while being completely asynchronous in terms of I/O. The OS is capable of running Weston and kmscon while effort is made into porting (a subset of) Xorg. Furthermore, Managarm supports many modern hardware devices, including USB 3 and has nearly full ACPI support.

Icon phone.png The official Managarm Discord server https://discord.gg/7WB6Ur3

Icon license.png Open source (MIT)

Icon site.png http://www.managarm.org

Icon floppy.png IMG, ~1GB

Icon clock.png Latest commit: 2024-05-29, is active


MaslOS2-demo.png

MaslOS 2

MaslOS 2 is a goofy 64-bit OS written in C++. It has a custom stdlib, a desktop and a custom GUI-Framework. It's the follow up to the original MaslOS. The main difference being an actual scheduler and support for ELF loading/execution. It is very WIP but quite a few things work already and it boots on real hardware. Mostly done just for fun. (Not POSIX compliant or anything)

Icon phone.png You can contact me using Discord @marceldarcel

Icon license.png Open-Source (AGPL-3.0)

Icon site.png https://github.com/marceldobehere/MaslOS-2

Icon floppy.png ISO, 64 MB

Icon clock.png Latest commit: 2024-05-08, is active


MentOS

MentOS (Mentoring Operating System) is an open source educational operating system. The goal of MentOS is to provide a project environment that is realistic enough to show how a real Operating System work, yet simple enough that students can understand and modify it in significant ways. There are so many operating systems, why did we write MentOS? It is true, there are a lot of education operating system, BUT how many of them follow the guideline defined by Linux? MentOS aims to have the same Linux's data structures and algorithms. It has a well-documented source code, and you can compile it on your laptop in a few seconds!

Icon phone.png The MentOS development team

Icon license.png MIT

Icon site.png https://mentos-team.github.io/

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-04-05, is active


MenuetOS

MenuetOS is a fully 32 bit assembly written graphical operating system. Menuet supports 32 bit x86 assembly programming as a faster and smaller system footprint. Menuet has no unix roots and the basic system is meant to be a clean asm based structure. Menuet isn't based in any particular operating system, since the idea has been to remove the extra layers between different parts of software, which complicate programming and create bugs. Menuet's application structure is not specifically reserved for asm programming since the header can be produced with practically any other language. However, the overall application programming design is intended for easy 32 bit asm programming. The GUI is extremely easy to handle with assembly language

Icon phone.png The MenuetOS development team

Icon license.png Proprietary :( 64 bit version ; Limited open source 32 bit version

Icon site.png http://www.menuetos.net/

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Latest release of open source 32-bit version: 2015-02-20, Latest release of proprietary 64-bit version: 2019-02-02


Merlon os.jpg

Merlon

Merlon is an operating system based upon my previous kernel, ATOS. It is designed to be easy to understand, and fairly lightweight (for example, it only requires 3MB of RAM to run on an x86). Currently only implemented for x86, but it should be easy to port to other platforms. Has a preemptive kernel which allows dynamic loading of kernel modules, and supports page replacements and a dynamically linked kernel-to-usermode API. Current working on implementing more of the C POSIX library.

Icon phone.png Alex Boxall, alexboxall3 [at] gmail [dot] com

Icon license.png BSD 3 Clause

Icon site.png https://github.com/alexdboxall/Merlon/

Icon floppy.png IMG, ~64MB

Icon clock.png Latest commit: 2024-06-01, is active


Metta bootup.png

Mettā

Mettā aims to be your mithril compass, that is, a device powerful in determining what is worth and what is not worth doing, in determining when it is the right time for doing so and also on doing the things it can do, without taking up your time.

Icon phone.png Berkus, berkus [at] exquance [dot] com

Icon license.png Open source (Boost)

Icon site.png https://github.com/berkus/metta

Icon floppy.png ISO, ~10MB

Icon clock.png Latest commit: 2020-02-17


MicroBe OS

Hobby OS aimed to learn how things are done. Written in x86 assembler. With huge time gaps developed since 1997 but so far no release available to public

Icon phone.png Vladimír Šiman, online [at] microbe [dot] cz

Icon license.png Proprietary :(

Icon site.png http://www.microbe.cz/

Icon floppy.png IMG, ~300KB

Icon clock.png Last commit: 2017-03-04


MikeOS.png

MikeOS

MikeOS is an operating system for x86 PCs, written in assembly language. It is a learning tool to show how simple 16-bit, real-mode OSes work, with well-commented code and extensive documentation. It has a BASIC interpreter with 46 instructions, supports over 60 syscalls, could manage a serial terminal connection and output the sound through PC speaker. There is also a file manager, text editor, image viewer and some games

Icon phone.png Mike Saunders, okachi [at] gmail [dot] com

Icon license.png Open source

Icon site.png http://mikeos.sourceforge.net/

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Latest release: 2022-04-09


MichalOS

MichalOS is a new x86 hobby OS project that is based on MikeOS: it has been created during the time when it seemed that MikeOS is abandoned, and has more features/programs compared to the original project. Also, these two projects seem to have a different focus: MikeOS appears better suited for education (i.e. has more documentation) while MichalOS is more about running/creating the cool stuff: has more games, a music player with nice "retro computing"-style music, etc.

Icon phone.png Michal Prochazka, https://www.prochazkaml.eu/

Icon license.png Open source

Icon site.png https://github.com/prochazkaml/MichalOS

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Latest commit: 2023-07-29, is active


Mintia.png

MINTIA

MINTIA is a late 1980s inspired multitasking and paging operating system, written entirely in a custom programming language. It runs on two hobby computer architectures, XR/station and fox32, and and sports sophisticated capabilities such as page swapping, fully shared file mapping, and fundamentally asynchronous I/O. It targets a 4MB RAM minimum, and has a custom API with 120 syscalls.

Icon phone.png Will, [email protected]

Icon license.png Custom source-available license

Icon site.png https://github.com/xrarch/mintia/

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-04-30


Qemu gui mkfree1.png

mkfreeOS

The kernel is developed in C++. It is designed to run on Intel x86 architecture. Supported functionalities: Multitasking, Multithreading, FAT32 and BFS file systems (proper for mkfree), Virtual memory manager, Controllers, Hierarchical protection domains (Kernel runs in ring 0 and user applications in ring 3). Multitasking: Each task is executed every 1ms intervals. For now all tasks have the same priority. There is a main thread of execution and it can have these states: 1- suspended, 2- waiting and 3- executing. Multiple threads: Each task can have several threads of execution and can have several states: 1- suspended, 2- waiting and 3- executing. GUI: Simple graphical interface.

Icon phone.png Ramón Mayedo, Ramón [at] gmail [dot] com

Icon license.png Open source

Icon site.png https://github.com/ramonmayedo/mkfreeOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2021-03-28



Mu-screenshot.png

Mu

Minimal software stack bootstrapped from 32-bit x86 machine code without any C. Supports SVGA with a single font (GNU Unifont), a PS/2_Keyboard, ATA disks using 28-bit PIO mode. Implemented in a memory-safe statement-oriented language, and includes a Lisp-based prototyping environment.

Icon phone.png Kartik Agaram

Icon license.png Open Source (GNU GPL v2)

Icon site.png https://github.com/akkartik/mu

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2023-12-19, is active



MVS/380

IBM's old IBM mainframe operating system (MVS) was public domain. With a freely available IBM hardware emulator available, this operating system was dusted off and being given a new life with some radical architecture changes. There's a similar VM/380 available too, for another IBM mainframe OS. Version 1.0 released and a group of people driving it forward on a daily basis instead of being a one-man project. Our homepage: http://mvs380.sourceforge.net

Icon phone.png Paul Edwards, fight [dot] subjugation [at] gmail [dot] com

Icon license.png Open source (Public Domain)

Icon site.png https://sourceforge.net/projects/mvs380/

Icon floppy.png IMG, ~10 MB

Icon clock.png Latest update: 2024-05-24, is active


MysticOS

MysticOS is an exokernel based OS. Its main goal is to be able to adapt to the users wishes and abilities at run time, providing the perfect environment for anybody. Current features include FreeBasic support and hardware accelerated graphics (2D and 3D). The OS is currently pre-alpha - there are no official releases yet. However, nightly builds, source code and documentation are available

Icon phone.png Marcel Sondaar, marcel_willem [at] hotmail [dot] com

Icon license.png Open source (GNU LGPL)

Icon site.png http://www.d-rift.nl/combuster/mos3/

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Latest commit: 2017-09-11


N

Nano

Small and simple operating system. There are 8086 real-mode (Nano16) and 386 protected-mode (Nano32) versions.

Icon phone.png vialamo at OSDev forums

Icon license.png Open source

Icon site.png https://github.com/NANO-DEV/

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Latest commit: 16-bit: 2020-01-13, 32-bit: 2020-01-26


NetDOS/32

32bit rewrite of my previous crappy operating system, NetDOS aka NetDOS/16. Will support multitasking and run NetDOS/16 programs.

Icon phone.png clementttttttttt at OSDev forums

Icon license.png dowhateveryouwantwithitidontcare

Icon site.png https://github.com/clementtttttttt/NetDOS-32

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2021-06-27


NexNix

NexNix is designed to be a powerful, safe, and modern operating system. It aims to take Unix and greatly improve on it, by making the filesystem more structured, being a true microkernel, implementing modern security measures, and being more GUI-centric. It still aims to be compatible with the vast majority of Unix programs. Currently, it only supports i386 and x86_64, with slowly developing ports to aarch64 and RISC-V 64.

Icon phone.png No Contact Information

Icon license.png Apache 2.0

Icon site.png https://github.com/nexos-dev/nexnix

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-02-27, is active


Night Kernel

The Night kernel is a 32-bit drop-in replacement for the original 16-bit kernel of the FreeDOS operating system. It uses linear memory addressing and operates in protected mode on the Intel x86 architecture. The typical user will retain compatibility with their DOS applications and gain protected mode abilities such as task switching between applications, protected memory and increased overall performance in a DOS environment. The community forum has moved from google groups to https://nightkernel.proboards.com/

Icon phone.png mercury0x0d-at-protonmail.com

Icon license.png Open source (GPLv3)

Icon site.png https://github.com/mercury0x000d/NightKernel

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-02-13, is active


nightingale

Nightingale is a small operating system with a vaguely UNIX-like userland. It supports multiple processes, loadable kernel modules, networking, and has a (fairly) full featured shell with pipes and file redirection. It has no video support, and only communicates with the outside world via the serial ports and network card.

Icon phone.png nightingale-at-tylerphilbrick.com

Icon license.png Open source (GPLv3)

Icon site.png https://github.com/tyler569/nightingale

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-05-16, is active


NOS

NOS is a microkernel OS project written in C++, making use of modern C++ standards (from C++11 onwards). It targets multiple architectures, is meant to be portable and provides a structured, object-oriented API. It is mostly inspired by the L4KA series of microkernels. Currently it is the basic kernel boot and thread creation / switching on x86 32-bit and 64-bit platforms

Icon phone.png Manuel Hohmann, XenOS at OSDev forums

Icon license.png None

Icon site.png https://github.com/xenos1984/NOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-04-23, is active


O

OpenXJ380

OpenXSKernel is a 32-bits operating system, based on the XINGJI Open Source License. It was presented by an operating system development project "XJ380(Code Whisty)" by XINGJI Studios(XINGJI Interactive Software). It has been discontinued from development.

Icon phone.png [email protected]

Icon license.png Open source (Other)

Icon site.png https://www.xingjisoft.top/product/open_sources/open.html

Icon floppy.png Unknown

Icon clock.png Stop Develop


OpenXSKernel

OpenXSKernel is a kernel development project for 64bits operating systems, based on the MIT open source license. It was presented by an operating system development project "XJ380" by XINGJI Studios(XINGJI Interactive Software). It will continue to be updated with the project "XJ380".

Icon phone.png [email protected]

Icon license.png Open source (MIT)

Icon site.png https://www.xingjisoft.top/product/open_sources/open.html

Icon floppy.png Unknown

Icon clock.png Active


Oberon System

The Oberon System is an academic operating system and an integrated software environment developed by Niklaus Wirth and Jürg Gutknecht since 1980s at ETH in Zürich. Currently it is a single-user, multi-core, multi-tasking system that runs on bare hardware or on top of a host operating system (currently Microsoft Windows or Linux). The developers aim at producing a reliable, real-time operating system suitable for embedded systems and for industrial and in particular medical applications. Earlier it was called "Aos" (Active Object System), a nomenclature that is still in use. It is written in the Active Oberon programming language, which evolved from Oberon, a programming language in the Pascal/Modula tradition. The graphical user interface is referred to as “Bluebottle”. See also: Oberon Operating System on Wikipedia and Lukas Mathis' Blog: Ignore the Code. Note that some stuff on these pages appear outdated, but this may be more a problem of keeping the Web-pages as current as the System. More current and in depth documentation is included in the systems, although you (sorrily) have to master their (partially) unconventional user-interface before you can access the documentation. Many dead links in Native Oberon reference site can be reanimated by replacing www with www-old. It has been revitalized in fall 2013 by Niklaus Wirth implementing a RISC processor in FPGA. See Project Oberon

Icon phone.png Forums - http://www.ocp.inf.ethz.ch/forum/ ; mailing list - https://lists.inf.ethz.ch/pipermail/oberon

Icon license.png Open source (BSD-like)

Icon site.png https://www.projectoberon.net/

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2022-12-29, is active. More info at SourceForge Native Oberon, Old ETH Oberon Home Page, Linz Oberon V4, SourceForge Oberon V4, and Project Oberon)


OS

OS for x86 with the goal to provide a complex system basics implemented with a maximum delay of 1 year (virtual memory, file systems, emulation, GUI, multitasking, clean-up of general information, drivers from other OSes, USB, SATA), and general study written in NASM, C and miscellaneous language snippets gathered from the usual PC demo code repositories, books, and study of professional programs. It aims at easily building a custom OS-like DOS application manually, simple or with all the available protection and system features, to study the implementation of the different system-level tasks. It contains simple 386 malloc/free functionality for paging, simple FAT32 LBA support for displaying files and folders with a simple fopen/readdir/Read_Disk/Read_Disk_DWORD for clusters, and several functions for handling VGA, PS/2, PIT timer, ATA-ATAPI. It boots from DOS and can return to it with the exittodos command, even under the newest laptops. Contains documentation in Spanish and English. Decompress the TAR to the root directory. c:\start.bat launches it. Has miniprograms that can be invoked as commands with arguments, and has fail-proof ATA-ATAPI detection (only primary master enabled by now). In 2021 it will add a basic emulator for being able to call things like video modes natively derived from the BIOS and to access the memory map from the kernel.

Icon phone.png ~ at OSDev forums

Icon license.png Open source (Public Domain or no license - to be treated as a simple replay view of writing random code as a game)

Icon site.png http://sourceforge.net/projects/lowest-kernel/files/

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest update: 2021-01-05


OS-on-kaleid.png

OS/K (OS on Kaleid)

A fully free as in freedom operating system concepted from scratch, with the only goal to be a hobby OS to learn and practice. It is under regular development, since the contributors are students.

Icon phone.png [email protected]

Icon license.png Free Software (GNU GPL version 3)

Icon site.png https://forge.chapril.org/os-k-team/os-k/src/branch/master/kaleid

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2021-02-22


OS/Z

OS/Z is an open-source, multiplatform, micro-kernel hobby OS written in C and assembly. It implements some interesting, non-standard concepts, and it's deliberately not fully POSIX compliant (although the API is POSIXish as much as possible). Its goal is to handle big amounts of data (in magnitude of yotta) in an user friendly, efficient way. Has it's own built-in debugger, memory allocator, unique VFS implementation and graphical interface protocol which is somewhere between X and Wayland. Currently supports x86_64 and AArch64 architectures and is under heavy development.

Icon phone.png bzt at OSDev forums

Icon license.png Open source (Creative Commons)

Icon site.png https://bztsrc.gitlab.io/osz/

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest update: 2020-11-02


opuntiaOS

opuntiaOS - an operating system targeting x86 and ARMv7. It features a kernel with great features like SMP and Ext2, custom runtime libraries for C/C++/ObjC and libraries for UI.

Icon phone.png [email protected]

Icon license.png BSD-2-Clause License

Icon site.png https://github.com/opuntiaOS-Project/opuntiaOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2023-04-06, is active


Oxide

Oxide or "02" is an OS for the 65xx family of processors and other mpu/mcu in embedded systems. Low run levels support headless or autonomous operation while higher runlevels are for human interfaces such as games, browsers, applications and media viewers. Next release is going to include the following features: X/Y coordinates, addition and subtraction, counter, select/reset. The project is going to be released at wayfarertechnologies.net (site is down, the author is seeking a new host)

Icon phone.png [email protected]

Icon license.png <undecided open source license; OS is for an open hardware platform>

Icon site.png http://forum.6502.org/viewtopic.php?f=2&t=7542

Icon floppy.png No releases yet; floppy - unlikely, ROM images are more likely

Icon clock.png Under development since ~2023


P

PatienceOS.png

PatienceOS

A baremetal C# kernel built using a combination of Microsoft tooling and the GNU toolchain. Unlike predecessors that relied on hand-rolling IL to ASM (eg. FlingOS, COSMOS), PatienceOS leverages Microsoft's .Net 8.0 out-of-the-box native IL to AOT cross compiler.

Icon phone.png info [at] bettersoftware [dot] uk

Icon license.png Open source (MIT)

Icon site.png https://github.com/FrankRay78/PatienceOS

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest update: 2024-05-29, is active


PDOS - Public Domain Operating System

One of very few operating systems that have an explicit "released to the public domain" notice. What that means is that if you spend time on this, and you later see a commercial use for it, there is absolutely no restriction on selling/modifying etc, any more than you would dig up Shakespeare and ask him if it's OK to use "Hamlet". It is designed to look like MSDOS, and the 8086 version can currently execute some MSDOS executables unchanged, the 80386 version can currently execute some Win32 executables (including gccwin - a modified GCC 3.2.3 for Windows msvcrt.dll) unchanged, and the S/3X0 version can currently execute some MVS executables unchanged (and on real IBM mainframe z/Arch hardware executes S/370 in effective AMODE 32 giving access to 4 GiB of memory), and the x64 UEFI version can execute some Win64 executables unchanged, including a completely public domain completely-self-hosting environment. It's written in C90, with some assembler. The public domain C compiler included (only) in the x64 version has a small amount of (included) C99 dependency. There is also a native ARM32 version.

Icon phone.png Paul Edwards, [email protected]

Icon license.png Open source (Public Domain)

Icon site.png http://pdos.org

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-05-30, is active


Pedigree

Monolithic OS with several backends supported - x86, x64, MIPS32, ARM and PowerPC. Kernel written in C++ with the obvious bits of ASM. Offers a reasonable amount of POSIX support and a tiling GUI and can run Apache, DOSBox, and various other common programs. Planned to also offer a native API alongside POSIX for Pedigree-specific applications

Icon phone.png JamesM, bluecode, pcmattman, IRC freenode.net#pedigree

Icon license.png Open source (ISC)

Icon site.png https://github.com/miselin/pedigree

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2023-05-29, is active


Perception

An x86-64 OS built around a microkernel. Custom build system, IPC IDL, UI toolkit. Not POSIXish. Userland is built in modern C++.

Icon phone.png AndrewAPrice

Icon license.png Open source (Apache 2)

Icon site.png https://github.com/AndrewAPrice/Perception

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-03-15, is active


PicoBSD

The stripped down version of FreeBSD for hobbyists and embedded systems developers. Its' primary difference is a tiny size, hence the "PicoBSD" name. Unlike OpenBSD (which provides the installation floppy with a limited set of features), PicoBSD is the only modern BSD system which could fit on a floppy - although, as the time passes and the BSD kernel grows in size - it becomes more and more difficult to fit. The archived floppies are available at https://sourceforge.net/projects/archiveos/files/p/picobsd/

Icon phone.png freebsd-embedded mailing list, https://lists.freebsd.org/mailman/listinfo/freebsd-embedded

Icon license.png Open source (BSD)

Icon site.png https://people.freebsd.org/~picobsd/old/picobsd.html

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Last update: 2017-11-18


Plan 42

A small public-domain OS, based on the 'nanos' nanokernel.

Icon phone.png Andy Elvey

Icon license.png Open source (Public Domain)

Icon site.png https://github.com/mooseman/plan_42

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Last commit: 2016-01-08, abandoned


Plant OS

A simple OS used to study made by several students

Icon phone.png [email protected]

Icon license.png Open source (MIT)

Icon site.png https://github.com/plos-clan/Plant-OS

Icon floppy.png '

Icon clock.png Active


PlusOS (Plus Operating System)

Plus operating system is hobby project. That's built to run as auxiliary OS with Major OS like Windows and Linux etc..bootable with grub2 and own boot loader.focused on eBook reading software(PDF,EPUB,MOBI,DJVU,CHM...).with programs like calculator, notepad,source code editor, hex viewer, text viewer,image viewer and many games.VESA 32bpp GUI from startup.read-only plus maybe writing support for standard file systems FAT/NTFS/EXT/CDFS.codec for archives(ZIP,RAR,7z,GZ ...).codec for image formats(JPG,BMP,GIF,PNG...).video player or at least thumbnails extract(AVI,MKV,MP4,3GP...). mountable as filesystem from ISO,ISZ file.generic drivers VBE,USB,HD Audio,Keyboard, mouse.bootable on qemu and of course on real computer systems.at least all drivers for one computer (my) this is primary goal. In summary goal is building a stable and usefull OS. A Project By Muhammad Arshad Latti.

Icon phone.png [email protected]

Icon license.png No License Information

Icon site.png https://sourceforge.net/projects/plusos/

Icon floppy.png ISO, ~4 MB

Icon clock.png Last commit: 2020-09-24


PrettyOS.png

PrettyOS

OS with a simple kernel created for educational purposes. A great care is put on keeping the code as readable as possible. PrettyOS is written in C and some i386 assembly (own bootloader). PrettyOS offers network, FAT12/16/32, uhci, ohci, ehci, xhci. My homepage: http://prettyos.de

Icon phone.png Dr. Erhard Henkes, http://prettyos.de

Icon license.png Open source (BSD)

Icon site.png https://sourceforge.net/p/prettyos/code/HEAD/tree/

Icon floppy.png Floppy, 1.44 MB

Icon clock.png Latest commit: 2017-06-17


Project_DragonFly_VOS

An Operating System development project that started back in 2013. This project's main objective is to create a minimal runtime environment that can be expanded by any willing programmer or power-user. The details of this project are open to public viewing. For more information about the intended design/architecture of this incomplete project, please click here: [2] This project will move at a slow pace, due to prior obligations on the part of the developer. For license details and limitations please see this document: [3] Please note that code comments in the OS Development repo follow a semi-specific format, for ease of reading and refactoring. Links to the public repo can be found here: [4] The TXP-Network websites have been down for some time now, due to the loss of the last web-host. The current link will not work.

Icon phone.png TopHatProductions115 [at] mail [dot] txp-network [dot] tk

Icon license.png Open source (TXP-Network)

Icon site.png [http:// txp-network [dot] tk/ http:// txp-network [dot] tk/]

Icon floppy.png Unknown

Icon clock.png Projected Release Year=TBA, Third rewrite and Research Phase, still in development.


Pure64

Pure64 is a second stage bootloader for 64-bit PC's with compatible Intel or AMD processors. The loader gets the computer into a full 64-bit state with no legacy compatibility layers. Pure64 also enables and configures all available Cores/CPUs in the computer. An information table is stored in memory after Pure64 is finished that stores important details about the computer. Our old website (http://www.returninfinity.com/pure64.html) is dead

Icon phone.png Ian Seyler, https://github.com/IanSeyler , iseyler [at] returninfinity [dot] com

Icon license.png Open source

Icon site.png https://github.com/ReturnInfinity/Pure64

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-05-15, is active


PaybackOS

PaybackOS is a simple OS that is being built as a simple CLI OS for servers and desktops a GUI is planned but not guarenteed, has not been tested on real hardware and needs a BIOS (since we rely on VGA text mode)

Icon phone.png Use github issues for contact.

Icon license.png Open source (CC0)

Icon site.png https://github.com/PaybackOS/PaybackOS

Icon floppy.png ISO, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2024-10-30, is active


Q

Quark Operating System

Quark is an Object Oriented 32 bit operating system. It aims to be a complete multitasking kernel.

Icon phone.png Ananth Shrinivas, compstud2001 [at] yahoo [dot] com

Icon license.png Open source

Icon site.png https://github.com/quark-os/quark-os

Icon floppy.png ISO, ??? MB (expected to be of a "floppy size")

Icon clock.png Last commit: 2017-09-19


QuasiOS

QuasiOS is a x86 64-bit operating system which will be build from the ground up, currently in assembly and C, but will migrate to our own OSL (Operating System Language), when the compiler is ready. It have three main focus goals. A password capability-based system with cryptographic filesystem. A modularized kernel where the modules is hot swappable, hence updates can be made live. User friendly configuration and interaction. Some of the work are going to be our master theses for the next year, and we expect rapid development during our theses (2020-2021).

Icon phone.png contact [at] quasios [dot] com

Icon license.png Open source (License will be updated at some point)

Icon site.png https://git.imada.sdu.dk/Sandsized/QuasiOS-64-bit

Icon floppy.png Unknown

Icon clock.png Last commit: 2020-03-10, can't find repository


Quinn

Quinn OS is a 32-bit x86 compatible protected mode hobby operating system with multitasking. There is a graphical user interface, FAT file system driver and basic TCP/IP stack.

Icon phone.png Andrew Pamment, apamment [at] yandex [dot] com

Icon license.png Open source

Icon site.png https://github.com/apamment

Icon floppy.png Unknown

Icon clock.png Latest commit: 2017-10-08, can't find repository


Qword1.png

qword

Kernel and distro written in C and x86 assembly targeted at x86_64. Our philosophy is "keep it simple and make it work", which seems to have been working so far.

Icon phone.png OS Development discord server (not associated with osdev.org), where most of the devs are: https://discord.gg/RnCtsqD

Icon license.png Open source

Icon site.png https://github.com/qword-os/qword

Icon floppy.png IMG, ??? MB (expected to be of a "floppy size")

Icon clock.png Latest commit: 2020-11-19, repository archived


R

Raidou.png

RaidouOS

x86_64 multitasking graphical operating system with support for PS/2, a round robin scheduler, and double-buffering for VESA 1280x1024 24-bit color mode. It has a custom font and simple terminal, as well as a basic desktop with window management. It can produce basic audio output through the PC speaker.

Icon phone.png aptrock327 on discord

Icon license.png Open source (GNU GPLv2)

Icon site.png https://github.com/AptRock327/RaidouOS

Icon floppy.png Unknown

Icon clock.png Latest commit: 2024-02-09, is active


RDOS

32-bit x86 based OS written mostly in assembly. Provides protection with segmentation and paging. Has drivers for FAT-based file systems, TCP/IP, USB, sound, LFB based VESA support with a GUI API. The user-level API is based on C++ classes. OpenWatcom is used for building both applications and device-drivers. Stable, has some 1000 commercial installations

Icon phone.png Leif Ekblad, leif [at] rdos [dot] net

Icon license.png Open source (GNU GPLv2) / Proprietary for commercial usage

Icon site.png http://www.rdos.net/svn/trunk

Icon floppy.png Unknown

Icon clock.png Latest commit: 2023-02, is active


ReactOS

A GPL project to clone WinNT written from scratch. It runs: Firefox, OpenOffice, Quake III Arena and much more. A lot of work is still need to be done. Looking for developers

Icon phone.png a team of developers, ros-general [at] reactos [dot] com

Icon license.png Open source (GNU GPLv2)

Icon site.png http://www.reactos.com

Icon floppy.png Unknown

Icon clock.png Latest release: 2019-02-24, is active


Reaver OS

Open source project striving to provide a µkernel and a set of necessary services. Written in modern C++, currently targeting AMD64 SMP systems. Not POSIXish. Timer framework, IPI framework, thread switching are finished. There's also a basic, dumb scheduler without wait queues. Work progresses on enabling userspace and basic syscalls

Icon phone.png Michał "Griwes" Dominiak, griwes [at] griwes [dot] info

Icon license.png Open source

Icon site.png https://github.com/griwes/ReaverOS

Icon floppy.png Unknown

Icon clock.png Last update: 2017-01-25


Red OS

32-bit microkernel designed for code readability.

Icon phone.png nick [at] primis [dot] org

Icon license.png Open source (BSD 2-clause)

Icon site.png https://github.com/primis/redos

Icon floppy.png Unknown

Icon clock.png Last update: 2016-04-28, abandoned


Redox

A Rust Operating System. Our homepage: http://www.redox-os.org/ . More information and screenshots can be found at: https://github.com/redox-os/redox/

Icon phone.png Redox Developers, info [at] redox-os [dot] org

Icon license.png Open source (MIT)

Icon site.png https://github.com/redox-os/redox/

Icon floppy.png Unknown

Icon clock.png Latest update: 2019-02-25, is active


racaOS

A Rust Operating System, Modular Kernel

Icon phone.png No Contact Information

Icon license.png No License Information

Icon site.png https://github.com/zzjrabbit/racaOS

Icon floppy.png Unknown

Icon clock.png


RISC OS

Designed in Cambridge, England by Acorn. First released in 1987, its origins can be traced back to the original team that developed the ARM microprocessor. Niche community using emulation, legacy systems and newer ARM hardware such as the BeagleBoard. "Shared source" fork (Castle Technology Ltd's RO 5) available for free non-commercial use, proprietary fork (RISCOS Ltd's RO 4 & 6) closed source. Stable, semi-defunct commercial use. Development currently focused on ARMv7 hardware

Icon phone.png RISC OS Open, https://www.riscosopen.org/content/contact

Icon license.png Open source

Icon site.png http://riscosopen.org

Icon floppy.png Unknown

Icon clock.png Latest commit: 2019-02-25, is active


rxv64

rxv64 is a rewrite of xv6, targeting multicore 64-bit x86\_64 machines. It is written in Rust and while still a pedagogical system it supports PCIe, AHCI, the APIC, fast system calls, SYSCALLQ/SYSRETQ.

Icon phone.png Dan Cross, crossd [at] gmail [dot] com

Icon license.png Open source (MIT)

Icon site.png https://github.com/dancrossnyc/rxv64

Icon floppy.png Unknown

Icon clock.png Latest commit: 2023-05-06, is active


S

SeaOS

SeaOS is a hybrid kernel with loadable modules that supports ATA, AHCI, EXT2, ELF, and many other fancy acronyms. It has basic networking support, initial VT-x support, and is self-hosting with a fairly complete unix-like userland. Designed for simplicity. My homepage: http://dbittman.github.io/seaos

Icon phone.png Daniel Bittman, danielbittman1 [at] gmail [dot] com

Icon license.png Open source (GNU GPLv2)

Icon site.png https://github.com/dbittman/seakernel

Icon floppy.png Unknown

Icon clock.png Last commit: 2016-05-13, abandoned


SerenityOS-8ea4375.png

SerenityOS

SerenityOS is a graphical Unix-like OS written in C++. It combines a 1990's style GUI with a modern CLI. Everything is from scratch, including a web browser with JavaScript and HTTPS support. A growing number of 3rd party packages are available as optional ports, including GCC, bash, vim, Python, SDL2, etc. You can watch videos of the system being developed on YouTube: https://www.youtube.com/c/AndreasKling.

Icon phone.png Andreas Kling, kling [at] serenityos [dot] org

Icon license.png Open source (BSD 2-clause)

Icon site.png https://github.com/SerenityOS/serenity

Icon floppy.png Unknown

Icon clock.png Last commit: Recently


SerpaeOS

SerpaeOS is a free, open-sourced x86 OS. It aims to provide a good resource for OSDevers to observe how certain features are implemented. Reach out to join the development team!

Icon phone.png Jaihson Kresak, serpaeos.devers [at] gmail [dot] com

Icon license.png GNU GPLv2

Icon site.png https://serpaeos.sourceforge.io

Icon floppy.png Unknown

Icon clock.png Active


Silcos

Silcos is a operating system that aims to provide a secure & robust environment for applications. It will sandbox all external executable files and also have advanced security in matter of object-management. It is in the development phase with the kernel being developed. The silcos kernel works in a modules which are dynamically loaded at runtime and divides itself into various modules like KernelHost, ModuleFramework, ObjectManager, and ExecutionManager, etc. It requires open-source support and will appreciate any!

It is currently being developed in C++ and has a very object-oriented approach. Full documentation is provided in the code itself. Other than that, good GitHub wikis document it very well.

Icon phone.png Shukant Pal, sukantk3.4 [at] gmail [dot] com

Icon license.png GNU GPLv3 (open-source)

Icon site.png https://github.com/SukantPal/Silcos-Kernel

Icon floppy.png Unknown

Icon clock.png Last commit: 2018-12-22, under rapid development, developers required


SimpleOS,

SimpleOS is a very simple Operating System coded mainly in C with a bit of Assembly.

Icon phone.png Harvey Xing, xingharvey [at] gmail [dot] com

Icon license.png Open source (MIT)

Icon site.png https://github.com/xing1357/SimpleOS/

Icon floppy.png Unknown

Icon clock.png Latest update: 2021-06-04, is active


SingOS

SingOS (Single Task Operating System) is a concept/pilot operating system that aims to do only one task at a time and provide all resources for that task. It is only in 16-bit real mode, with a single feature in 32-bit protected mode. The special thing is the version which is strictly using original IBM PC BIOS calls, and should be compliant with IBM PC 5150. https://git.imada.sdu.dk/Sandsized/SingOS_Legacy_BIOS This might be the only of the versions which would be active, since we have started to develop QuasiOS (which will be a full functional 64-bit OS). At the university we have a historical collection of computers, why we have fun to make a operating system which runs on those machines. It's mostly fun, and is not well developed yet.

Icon phone.png contact [at] singos [dot] dk

Icon license.png Open source

Icon site.png https://git.imada.sdu.dk/Sandsized/SingOS

Icon floppy.png Unknown

Icon clock.png Last commit: 2019-09-20, Only updated occasional


SivelkiriaOS

Sivelkiria is a new operating system at early stage of development. It aims to provide a platform which unites all software solutions into a harmonic whole, thus taking user experience to the next level. In Sivelkiria, compatibility of all programs is guaranteed by design. Using any device becomes easy and comfortable. The software designed for Sivelkiria OS can be used in any context.

Icon phone.png contact [email protected]

Icon license.png Open source (BSD 2-clause "Simplified" License)

Icon site.png https://git.sivelkiria.org/

Icon floppy.png Unknown

Icon clock.png Active


SkiftOS.png

skiftOS

skiftOS is a hobby operating system built for learning and fun targeting the x86 platform. It features a kernel named hjert, a graphical user interface with a compositing window manager, and familiar UNIX utilities.

Icon phone.png Nicolas Van Bossuyt, nicolas.van.bossuyt [at] skiftos [dot] org

Icon license.png Open source (MIT)

Icon site.png https://github.com/skiftOS/skift

Icon floppy.png Unknown

Icon clock.png Last commit: Recently


SnowdropOS.png

Snowdrop OS

Snowdrop OS is a small-scale 16-bit real mode operating system for the IBM PC architecture. Snowdrop was developed from scratch, using only assembly language. Snowdrop boots from a FAT12 filesystem (floppy disk) and comes with a shell, aSMtris (a Tetris clone), and a few other example programs that could greatly simplify the development - for example, see http://sebastianmihai.com/snowdrop/gamedev.php

Icon phone.png email address on website below

Icon license.png Open source (Public Domain)

Icon site.png http://sebastianmihai.com/snowdrop/

Icon floppy.png Unknown

Icon clock.png Latest update: 2017-07-21, is active


SO3

Smart Object Oriented Operating system is a compact, lightweight, full featured and extensible operating system particularly well-suited for embedded systems in general.

Icon phone.png https://gitlab.com/smartobject/so3

Icon license.png Open Source (GPL2)

Icon site.png https://gitlab.com/smartobject/so3

Icon floppy.png Unknown

Icon clock.png March 05, 2021


Sortix.png

Sortix

Sortix is a small self-hosting operating-system aiming to be a clean and modern POSIX implementation. It is a hobbyist operating system written from scratch with its own base system, including kernel and standard library, as well as ports of third party software. It has a straightforward installer and can be developed under itself. Releases come with the source code in /src, ready for tinkering.

Icon phone.png https://sortix.org/

Icon license.png Open source (ISC)

Icon site.png https://sortix.org/

Icon floppy.png Unknown

Icon clock.png January 03, 2019 -- 1.0


Soso-v0.3-gears.png

Soso

Soso is a Unix-like 32bit operating system. Its features are multitasking with processes and threads, paging, Virtual File System, FAT32, system calls, basic Musl libc port, userspace ELF files, framebuffer (/dev/fb0), mmap, PS/2 mouse, Unix local sockets, and shared memory.

Icon phone.png No Contact Information

Icon license.png Open source (BSD 2-clause)

Icon site.png https://github.com/ozkl/soso

Icon floppy.png Unknown

Icon clock.png Last commit: 2021-03-15, in active development


T

tachyon

tachyon is another Hobby OS, longing to support x86_64 only. Currently, it boots on qemu, bochs, virtualbox and real hardware. it has not much to see, really, but a working physical and virtual memory management (still improving), kernel and user threads and some other hardware interfacing... Basic goal was to create everything from scratch with a clean code base. It uses a plugin mechanism to load different supported kernel components.

Icon phone.png mduft on GitHub

Icon license.png Open source (MIT)

Icon site.png https://github.com/mduft/tachyon3

Icon floppy.png Unknown

Icon clock.png Latest update: 2023-02-06


TatOS.png

tatOS

A 32bit x86 OS written in assembly featuring a protected mode driver for USB flash drive and mouse. Source package includes tedit editor and ttasm assembler. Supports UHCI, EHCI, PS2 keyboard and 800x600x8bpp graphics - has a basic GUI

Icon phone.png Tom Timmermann

Icon license.png Open source

Icon site.png https://github.com/tatimmer/tatOS

Icon floppy.png Unknown

Icon clock.png Latest commit: 2016-07-23, may be abandoned


TempleOS.png

TempleOS

TempleOS is a 64 bit lightweight OS with multitasking and multicore support, which is ring-0-only and works in a single address space. It provides the interface for communicating with God: the user has to choose a random number from the constantly changing sequences and then it is converted to the text interpretation. Whole OS with its' software has been single-handedly created during 15 years by Terry A Davis - who also developed a programming language called Holy C together with a special compiler for it. TempleOS supports the FAT32 and RedSea filesystems (the latter created by Terry) and also the file compression. It doesn't support the networking, partially for ideological reasons, but there are forks available with added functionality

Icon phone.png Terry A Davis, http://www.templeos.org

Icon license.png Open source (Public Domain)

Icon site.png http://templeos.org/

Icon floppy.png Unknown

Icon clock.png (Author passed away)


Tilck screenshot.png

Tilck

Tilck (Tiny Linux-Compatible Kernel) is a x86 monolithic preemptable kernel designed to be partially compatible with linux-i686 at binary level. For the moment, it's mostly an educational project: the perfect playground for playing in kernel mode while retaining the ability to compare how the very same usermode bits run on the Linux kernel as well. In the long term, the project targets the embedded world and ARM, including MMU-less systems. Currently, the project has full ACPI support and can run software like BusyBox, VIM, fbDOOM, Lua, TinyCC, without any customizations. Part of the project are also an interactive bootloader (both legacy BIOS and UEFI boot) and a solid test infrastructure, with extras like kernel coverage.

Icon phone.png vladislav [dot] valtchev [at] gmail [dot] com

Icon license.png Open source (BSD 2-clause)

Icon site.png https://github.com/vvaltchev/tilck

Icon floppy.png Unknown

Icon clock.png Latest commit: 2021-08-10, is active


TinyOS

Event-driven operating system targeted for wireless sensor network embedded systems. Has a megalithic kernel architecture

Icon phone.png https://github.com/tinyos/tinyos-main

Icon license.png Open source (BSD)

Icon site.png https://github.com/tinyos/tinyos-main

Icon floppy.png Unknown

Icon clock.png Latest commit: 2018-12-13, is active


Toaruos screenshot.png

ToaruOS (とあるOS)

A complete educational operating system for x86-64 PCs, with a bootloader, kernel, libc, window compositor, graphical applications, and Unix-like utilities.

Icon phone.png #toaruos on libera.chat

Icon license.png Open source (NCSA/University of Illinois license)

Icon site.png http://github.com/klange/toaruos

Icon floppy.png Unknown

Icon clock.png Latest commit: 2023-01-05, is active


TravorOS 20180422.png

TravorOS

A research-purpose Operating System that discovers features on Intel x86 processors which is inspired by Linux. Welcome to contribute!

Icon phone.png Travor Liu <travor_lzh [at] outlook [dot] com>

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/TravorLZH/TravorOS

Icon floppy.png Unknown

Icon clock.png Latest commit: 2018-08-07, abandoned


Tupai-0-1-0.png

Tupai

Tupai is a monolithic unix-inspired operating system kernel that runs on i386-compatible machines.

Icon phone.png Joshua Barretto, joshua.s.barretto [at] gmail [dot] com

Icon license.png Open source (GNU GPLv3)

Icon site.png https://gitlab.com/zesterer/tupai/commits/dev

Icon floppy.png Unknown

Icon clock.png Latest commit: 2017-08-03


týndur

The microkernel-based community OS of the German OS development community Lowlevel. See the tyndur 0.2.2 announcement in the forum

Icon phone.png tyndur-devel mailing list, tyndur-devel [at] tyndur [dot] org ; Kevin at OSDev forums

Icon license.png Open source

Icon site.png https://git.tyndur.org/lowlevel/tyndur/commits/master

Icon floppy.png Unknown

Icon clock.png Latest update: 2018-01-06


Tysos

The type-safe operating system is a 64-bit multitasking microkernel written in C#. Ahead-of-time compiler is mostly complete, work has switched to implementing the kernel

Icon phone.png John Cronin, jncronin [at] tysos [dot] org

Icon license.png Open source

Icon site.png https://github.com/jncronin/tysos

Icon floppy.png Unknown

Icon clock.png Last update: 2021-02-01


U

Uinxed-Kernel

This project is a kernel development project for operating systems based on the GPL-3.0 open source license, named Uinxed-Kernel. It was initiated in 2024 by MicroFish and Rainy101112 et al. and continues to be developed.

Icon phone.png [email protected]

Icon license.png Open source (GNU GPL 3.0)

Icon site.png http://uinxed-kernel.asia/

Icon floppy.png Unknown

Icon clock.png Active


Unet Operating System

Unet is a Unix-like operating system that offers the best compatibility for various platforms. Whether you need a server, a desktop, or an embedded system, Unet can meet your needs. Unet also provides advanced networking, security, and storage features, and supports most popular embedded storage and networking devices.

Icon phone.png [email protected] or https://discord.gg/7VxhnqeSUf

Icon license.png Proprietary

Icon site.png No URL

Icon floppy.png Unknown

Icon clock.png Active


UDOS.png

UDOS

A mainframe OS - yes it's compatible with z/Arch albeit lacks SYSG support.

Icon phone.png Superleaf1995

Icon license.png Open source (Public Domain - Unlicense)

Icon site.png https://github.com/SuperLeaf1995/uDOS

Icon floppy.png Unknown

Icon clock.png Abandoned, can't find repository


Ultibo core

A unikernel environment based on the Free Pascal compiler and Lazarus IDE, initially targeting single board computers such as Raspberry Pi and also supporting QEMU the design is intended to be portable to other platforms. The modular architecture allows applications to pick and choose what features to use in a project and the compiler produces a bootable kernel image which includes all of the required RTL components. Comes with a comprehensive list of features including pre-emptive threading, multicore support, IPv4 networking, FAT/NTFS/CDFS file systems, USB support, SD/MMC support, drivers for common peripherals such as GPIO, I2C, SPI, PWM, and DMA, C library support, hardware accelerated OpenGL ES and OpenVG graphics and much more. Packaged in an installer download for Windows or as an install script for Linux customized versions of both Free Pascal and Lazarus IDE are included along with full source and a large collection of examples. Our homepage: https://ultibo.org/

Icon phone.png info [at] ultibo [dot] org

Icon license.png Open source (GNU LGPL 2.1 with static linking exemption)

Icon site.png https://github.com/ultibohub/

Icon floppy.png Unknown

Icon clock.png Latest commit: 2021-05-14, is active


Upanix

Upanix – an x86 based 32 bit operating system designed and developed in C++. It uses x86 architectural features for memory management (paging, segmentation) and process management (TSS, Call Gates, Interrupt Gates). Aim is to build a minimal complete OS which supports USB storage, ELF binaries/dlls, GCC/g++ compiler and build tools, Internet (wifi) and a basic UI

Icon phone.png Prajwala Prabhakar, srinivasa_prajwal [at] yahoo [dot] co [dot] in

Icon license.png Open source (GNU GPLv3)

Icon site.png https://github.com/prajwal83/upanix

Icon floppy.png Unknown

Icon clock.png Latest commit: 2018-06-11


U365 0.6.png

U365

U365 is a monolithic 32-bit OS in its alpha stage. It includes VFS, STDIO, keyboard and mouse drivers, VESA modes and some simple screen surface management. We used C and Assembly to code it.

Icon phone.png osdever (Nikita Ivanov) and k1-801 (Dmitry Kychanov) ; krasota156 [at] gmail [dot] com - osdever's email

Icon license.png Open source (Apache 2.0)

Icon site.png http://gitlab.com/bps-projs/U365

Icon floppy.png Unknown

Icon clock.png Latest commit: 2017-05-17


V

VanadiumOS.png

Vanadium OS

Vanadium OS is a multi-user Unix-like OS. i386, amd64. Fully protected mode. Memory, file and hardware protection. root and unprivileged users. GUI without X, modular kernel, and has a live floppy image with a single user mode! My homepage: http://www.durlej.net/contact ; project pages: http://www.durlej.net/v/ , http://www.durlej.net/nameless , https://github.com/p-durlej/newsys . One of the great features is that you can write C code and instantly compile it to execute

Icon phone.png Piotr Durlej, http://www.durlej.net/contact

Icon license.png Open source (BSD 2-clause)

Icon site.png https://github.com/p-durlej/newsys

Icon floppy.png Unknown

Icon clock.png Abandoned


Vinix.png

Vinix

Vinix is a 64-bit UNIX-like OS written in the V programming language, that aims to be source compatible with most Linux/*nix programs. It aims to be approachable and be runnable on real hardware. It can run a vast array of Linux userland software including bash, GCC, and X.org, amongst others.

Icon phone.png No Contact Information

Icon license.png Open source (GNU GPLv2)

Icon site.png https://github.com/vlang/vinix

Icon floppy.png Unknown

Icon clock.png Active


Visopsys.png

Visopsys

Visopsys (VISual OPerating SYStem) is an alternative operating system for PC-compatible computers, written “from scratch”, and developed primarily by a single hobbyist programmer since 1997. Its primary "useful feature" is a reasonably functional partition management program - the ‘Disk Manager’, which can create, format, delete, resize, defragment, copy, and move partitions, and modify their attributes. It supports both DOS/MBR and UEFI partition tables. It can also copy hard disks, and has a simple and friendly graphical interface. A basic version can fit on a bootable floppy disk, or you can use the entire system from a ‘live’ CD/DVD

Icon phone.png Andy McLaughlin, andy [at] visopsys [dot] org

Icon license.png Open source (GNU GPLv2)

Icon site.png http://visopsys.org/

Icon floppy.png Unknown

Icon clock.png Last commit: 2023-09-21, is active


VSTa

VSTa is a copylefted system, originally written by Andrew Valencia, which uses ideas from several research operating systems in its implementation. It attempts to be POSIXish except where POSIX gets in the way, and runs on a number of different PC configurations. VSTa is also designed to take advantage of SMP right out of the box. My homepage: http://www.vsta.org

Icon phone.png Andrew Valencia, https://github.com/vandys

Icon license.png Open source (GNU GPLv2)

Icon site.png http://sources.vsta.org:7100/vsta/index

Icon floppy.png Unknown

Icon clock.png Last commit: 2015-01-12, abandoned


W

WingOS

WingOS is an basic open source 64bit Operating System written from scratch with c++ and a little bit of assembly. WingOS has SMP support.

Icon phone.png No Contact Information

Icon license.png open source (MIT)

Icon site.png https://github.com/Supercip971/WingOS_x64/

Icon floppy.png Unknown

Icon clock.png Latest commit: 2020-12-24, is active


X

XJ380 OS

XJ380 is a 64-bits graphical operating system. It was launched in 2022 by XINGJI Studios(XINGJI Interactive Software). It will continue to be developed.

Icon phone.png [email protected]

Icon license.png Proprietary :(

Icon site.png https://www.xingjisoft.top/product/os/xj380.html

Icon floppy.png Unknown

Icon clock.png Active


XEOS

XEOS is an experimental 32/64 bits Operating System for x86 platforms, written from scratch in Assembly and C. It includes a C99 Standard Library, and aims at POSIX/SUS2 compatibility.

Icon phone.png Jean-David Gadina - XS-Labs - www.xs-labs.com

Icon license.png Open source

Icon site.png http://www.xs-labs.com/en/projects/xeos/

Icon floppy.png Unknown

Icon clock.png Latest commit: 2017-01-11


xOS

xOS is a hobbyist operating system project written mostly from scratch for the PC, entirely in FASM-style assembly. The principal goal of xOS is to be compact and lightweight, yet be suitable for use in the 21st century, in terms of speed, features and hardware support. As such, xOS supports IDE and SATA hard disks, partial support for USB, networking, a rudimentary web browser, and a compositing graphical user interface. The kernel and drivers have been written entirely in assembly, while applications can be written in C.

Icon phone.png omarx024 [at] gmail [dot] com

Icon license.png Open source (MIT)

Icon site.png (link is dead) http://omarrx024.github.io/ (link is dead)

Icon floppy.png Unknown

Icon clock.png Latest commit: 2017-07-09, possibly abandoned


xv6

xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson's Unix Version 6 (v6). xv6 loosely follows the structure and style of v6, but is implemented for a modern RISC-V multiprocessor using ANSI C.

Icon phone.png No Contact Information

Icon license.png Open source (MIT)

Icon site.png https://github.com/mit-pdos/xv6-riscv

Icon floppy.png Unknown

Icon clock.png


XtOS

XtOS is an operating system with a kernel written in C and a userspace written in C source code which is interpreted on runtime. The C interpreter is based on TinyC and implemented inside the kernel along with the window manager. Everything runs in Ring 0 and C applications are able to access most of the functions that the kernel is able to.

Icon phone.png [email protected]

Icon license.png Open source

Icon site.png (link is dead) https://git.dorper.me/projects/XT (link is dead)

Icon floppy.png Unknown

Icon clock.png Latest commit: 2018-08-24


Y

YaxOS

YaxOS is a very primitive OS running in real mode.

Icon phone.png [email protected]

Icon license.png GPLv3

Icon site.png https://gitlab.com/SopaXorzTaker/yaxos

Icon floppy.png Unknown

Icon clock.png Latest commit: 2018-12-26, is active


Z

Zeal 8-bit OS

Conceived as a hardware abstraction layer for Z80-based computers, Zeal 8-bit OS is a single-tasking operating system with a small, concise Unix-like API. It is ROM-able, modular and configurable. Header files are included for assembly language and C. Videos for Zeal 8-bit OS and Computer: https://www.youtube.com/@Zeal8bit Web emulator for Zeal 8-bit Computer: https://zeal8bit.github.io/Zeal-WebEmulator/

Icon phone.png contact [at] zeal8bit [dot] com

Icon license.png Open source (Apache 2.0)

Icon site.png https://github.com/Zeal8bit/Zeal-8-bit-OS

Icon floppy.png Unknown

Icon clock.png Latest update: 2023-04-05, is active


ZeldaOS

Written in C from scratch, ZeldaOS is an UNIX-like kernel which is aiming for POSX.1 compliance and running on any x86 and x86_64 processors. Also, the kernel is designed to support more and more networking features.

Icon phone.png [email protected]

Icon license.png Proprietary

Icon site.png https://github.com/chillancezen/ZeldaOS

Icon floppy.png Unknown

Icon clock.png Latest update: 2019-05-26, is active


ZeldaOS.x86_64

Written in C from scratch, ZeldaOS.x86_64 is a 64_bit kernel which supports x86_64 features, it's also a bare metal hypervisor with Intel VT-x technology.

Icon phone.png [email protected]

Icon license.png Proprietary

Icon site.png https://github.com/chillancezen/ZeldaOS.x86_64

Icon floppy.png Unknown

Icon clock.png Latest update: 2019-06-25, is active