awesome-os

A fork of Plan 9, designed for distributed, networked computing

Research Operating System is a lightweight, efficient, and flexible desktop operating system, designed to help you make the most of your computer. It's an independent, portable and free project, aiming at being compatible with AmigaOS at the API level

AlmeidaOS

x86-64 OS with its own bootloader, scheduler and limited libc all written from scratch

Animal

32 bit multithreaded operating system (formerly Gramado)

AurixOS

A small multiplatform Operating System designed for developers and creators

Operating System that is designed to be POSIX compliant and mostly ISA transparent

, - 64 bit operating system written in Assembly for x86-64

Basekernel

A simple OS kernel for research, teaching, and fun

BoneOS

OS for everyone built by everyone

Bottlerocket OS

Linux-based OS meant for hosting containers

Brutal

An operating system inspired by brutalist design that combines the ideals of UNIX from the 1970s with modern technology and engineering

cavOS

Amd64 operating system in C. Trying to make a full OS, with a simple and readable codebase

Charlotte

CharlotteOS kernel in Rust

a complete development environment for embedded applications including RTOS, an HAL, peripheral drivers, support files and tools

A unikernel OS inspired by Plan9 and Nix developed at

Cyjon

pure x64 assembly language operating system (related to project)

DragonOS

An x86-64 OS build from scratch

Dreamos64

An x86-64 hobby os built from scratch

Configurable operating system kernel designed for resource constrained and embedded systems

, - 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

Fern-Night

C language operating system (related to project)

, - A UNIX-like kernel for the i386 architecture

Fomos

Experimental OS, built with Rust

, - IoT operating system for microcontrollers, by Amazon

GarnOS

Hobby OS powered by a modular kernel

A FOSS operating system framework consisting of a microkernel abstraction layer and a collection of userspace components

Gloire

An OS built with the kernel (a partially formally verified kernel with a small footprint for general-purpose and embedded OSes, written in SPARK and Ada) and GNU tools

, - A free OS designed to be compatible with Windows executables

experimental operating system written entirely from scratch

A distributed operating system

HelenOS

multikernel multiserver OS

Haskell User's Operating System and Environment

Hubris is an operating system for microcontrollers developed by Oxide Computer Company in Rust

illumos is a Unix operating system which provides next-generation features for downstream distributions (like OmniOS, OpenIndiana, and Tribblix)

Interim

Minimalist OS with concepts from Lisp machines and Plan9

JSD-OS

A small operating system for 32 bit x86

, - OS inspired by Plan9, 9front and Harvey OS

KiddieOS

UNIX-like 64-bit operating system written in Assembly, C++

KnightOS

for z80 calculators

MenuetOS fork

L4re

Operating system and hypervisor for security/safety-critical and virtualization-enabled applications

, - UNIX-like 64-bit operating system written in C++

Mako

Hobby OS for x86 from scratch, written in C

MaslOS

A 64 bit GUI multitasking Hobby OS written mostly from scratch in C++ and a bit of C/ASM

MeetixOS

A hobby OS written in modern C++20 which aims to be Unix-like

MentOS

An educational 32-bit linux-like Operating System

Hobby OS supporting 32 and 64 bit, written in Assembly language

, - Simple unix-like operating system for education and research purposes. MIPS microkernel

, - Research Operating System that runs Scheme on bare-metal

Minoca OS

General purpose OS, written in C

MollenOS

MollenOS/Vali is a modern operating system that is built with focus on abstraction and a modular design, allowing anyone to port it to any architecture. It currently targets the x86-32 and x86-64 platform

Monolithic kernel in C

An OS for the Nintendo Entertainment System!

Nanos

Unikernel that is linux-compatible, written in C

NodeOS

OS using NodeJS and Linux

Northport

Monolithic kernel and support libraries for riscv64 and x86_64

Hobby OS based on , written in Assembly Language

Pidi OS

Independent and minimalistic OS

, - ToaruOS-based, My Little Pony themed OS

PouplyOS

Simple OS for fun and learning, named after the ESISAR mascot Poulpy

PureDarwin

PureDarwin is a community project to extend Darwin into a complete, usable operating system

Security-focused OS built on the Xen hypervisor, designed to isolate different compartments based on levels of trust

RavynOS

A BSD-based OS project that aims to provide an experience like and some compatibility with macOS (formerly known as airyxOS)

Redox

written in Rust

RustyHermit

A Rust-based, lightweight unikernel

, - Sanos is a minimalistic 32-bit x86 operating system kernel for network server appliances running on standard PC hardware

SayoriOS

Hobby OS for x86 computers, currently under active development, written in C

Genode based OS

Serenity

Graphical Unix-like operating system for x86 computers

SimpleOS

Simple Operating System coded in C and Assembly

a homebrew operating system from scratch, in assembly language

Hobby OS in C and C++ by Jonas 'Sortie' Termansen

Successor of AtheOS, Syllable is designed in the tradition of the Amiga and BeOS, but built using many parts from the GNU project and Linux

SynestiaOS

32/64 bit operating system written in C for arm platform

TempleOS

Religious OS :-)

Theseus

A modern experimental OS written from scratch in Rust to explore novel OS structure and state management techniques

Thor

64bit operating system mostly written in C++

ToaruOS

Hobby operating system from scratch

Hobby operating system build by the Lowlevel community. Written in C and Pascal

Ultron OS

x86 Operating System written in C++, High School Project

Unikraft

A modular unikernel for specialization, high efficiency, performance, and security; Linux/POSIX-compatible; mostly in C

Vinix

Vinix is an effort to write a modern, fast, and useful operating system in the V programming language

Open Source Hobby OS developed since 1997

Windows 95 in Electron

Hobby Windows 95 implementation in Electron

A teaching operating system developed in the summer of 2006 for MIT's operating systems course

ZealOS

The Zeal Operating System is a modernized, professional fork of the 64-bit Temple Operating System, TempleOS

ackOS

A simple 64-bit operating system

aurora_os

Written in Rust

dahliaOS is a modern, secure, lightweight and responsive operating system, combining the best of GNU/Linux and Fuchsia OS

duckOS

A hobby UNIX-like OS with a graphical window manager for x86 computers

eggos

A Go unikernel running on x86 bare metal

emerald

An operating system kernel written for fun in C

gopher-os

A proof of concept OS kernel written in Go

hhuOS

hhuOS is a small operating system written in C++ and Assembler for the x86-architecture. The main purpose 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 full-featured operating system for daily use

hydrogen

toy OS. 64-bit, preemptive multitasking kernel supporting EFI, PCIe, SATA, framebuffer graphics mode, HFS+

x86 kernel and distribution powered by mlibc, GNU userland tools, and other common *nix software

managarm

Pragmatic microkernel-based OS with fully asynchronous I/O

menix

A minimal and expandable Unix-like operating system

moros

MOROS is a hobby operating system written in Rust for the x86 architecture

mOS

A hobby operating system developed from scratch

nopeos

Simple OS kernel with BASIC interpreter for x86

octox

Unix-like OS in Rust inspired by xv6-riscv

oneOS

x86-32 and ARMv7 kernel with pre-emptive multi-threading, window manager and editor

opuntiaOS

an operating system targeting x86, ARMv7, Aarch64

orange_slice

A research kernel and hypervisor attempting to get fully deterministic emulation with minimum performance cost. In Rust

OrchestrOS

A simple, hobby, 64-bit operating system. This is a rewrite of GarnOS that focuses on simplicity, portability and maintainability. Written in C

pranaOS

A unix operating system written from scratch in c / c++

An OS made by an independant developer, still in developement, like MS-DOS, but in qbasic. It's MADE with qb64

r3

A hobby x86_64 Operating System kernel written in Rust -- with minimal functionalities

ravynOS

BSD-based OS project that aims to provide an experience like and some compatibility with macOS (formerly known as airyxOS)

, - A simple, handmade, operating system with a graphical user interface

soso

Simple unix-like operating system written in Nasm assembly and mostly in C

tilck

A Tiny Linux-Compatible Kernel

, - A secure embedded operating system for microcontrollers

unox-os

Unox is an educational unix-like operating system

willOS

A minimal 64 bits kernel (Operating System that cannot "operate" a lot of things)

Darwin XNU

The XNU kernel source code for use in MacOS and iOS

, - Unix-like operating system based on the BSD

DOS compatible OS

Haiku

BeOS inspired OS

Linux

Linux kernel

, - Unix-like operating system based on a microkernel architecture

MS-DOS

The original sources of MS-DOS 1.25 and 2.0

, - Unix-like operating system based on the BSD

, - Unix-like operating system based on the BSD

An OS from the creators of Unix, extending the Unix philosophy of "everything is a file" with a network-centric file system, namespaces and distributed computing

, - A free Windows-compatible Operating System

AT&T UNIX System V Source Code

How to Make a Computer Operating System

in C++

A follow along book to build IntermezzosOS in Rust

Covers the entire range of kernel tasks, available as chapters or one PDF

by and

A Brief Introduction to Operating Systems by

OS from the ground up in C

Easy to read book covering virtualization, concurrency and persistence

Book for Xv6

Bootstrap yourself to write an OS from scratch by

Osdev Notes

How to write an operating system from scratch by and

by University of Cambridge

Build a minimal multi-tasking OS kernel for ARM from scratch

by Jim Huang

by Brandon Friesen

How to write a Linux kernel patch and submit it

by Greg Kroah-Hartman

Presentation on how the Linux kernel is developed

by Greg Kroah-Hartman

os-tutorial - How to create an OS from scratch

by Carlos Fenollosa

by James Molloy

by Philipp Oppermann

by Stephen Marz

by Leo Whitehead

by Arjun Sreedharan

by Arjun Sreedharan

by Joe Bergeron

by Alex Parker

mya

a fun project to create OS from scratch by Erfan

Stories around the Genode Operating System

Wiki with everything you need to know

A wiki about creating an OS from scratch. In German

Standards for maintaining compatibility between operating systems

Newsletter about OS development in Rust

List of open source real-time operating systems

The Multicians web site presents the story of the Multics operating system for people interested in the system's history

by Cody Cutler, M. Frans Kaashoek, and Robert T. Morris, MIT CSAIL

by Samuel Yvon, Marc Feeley, Scheme 2020

by Kuenzer et al., EuroSys 2021

b4

, , a tool to help with email-based patch workflows

clang-extract

a tool to extract code content from source files using the clang and LLVM infrastructure

hackermail

a mails management tool for hackers who collaborate using mailing lists

kworkflow

reduce the overhead with infrastructure setup for Linux development

virtme-ng

quickly build and run kernels inside a virtualized snapshot of your live system

by Shuah Khan

by Sanjeev Sharma

by Surya Prabhakar

,