Open Source Desktop Operating Systems Operating System Kernels

ReactOS is an open source effort to develop a quality operating system that is compatible with applications and drivers written for the Microsoft Windows NT family of operating systems (NT4, 2000, XP, 2003).

The AROS Research Operating System is an effort to implement an Open Source and portable operating system that is compatible with AmigaOS(TM). Originally, it was meant as a direct reimplementation, but already has features not existing in AmigaOS.

FreeDOS is an open source DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or write new DOS programs. Any program that works on MS-DOS should also run on FreeDOS.

First version of OpenVPN opensource software that is compatible with IPv6.

This project is for the portable computer "Cambridge Z88", produced by Sir Clive Sinclair (of ZX Spectrum fame). We continue to support software development (ROM, 3rd party apps on memory cards and desktop applications). We have moved to https://cambridgez88.jira.com/wiki (development, source code and documentation). However, we continue to publish files for download here.

DOS/32 Advanced DOS Extender is a drop-in replacement for the DOS/4GW DOS Extender and compatibles. Being fast, small and flexible DOS/32A can be used in many environments, from embedded systems to DOS emulators, by both developers and end users alike.

nxtOSEK is an RTOS for LEGO Mindstorms NXT. nxtOSEK consists of I/O driver part of LEJOS NXJ, TOPPERS/ATK1 RTOS, and glue code for them. You can write applications for NXT in ANSI-C/C++. Check nxtOSEK site: http://lejos-osek.sourceforge.net

Public Domain Operating System (currently x86 and 80386 and S/370 and S/390). Note that latest source code is here in git, but latest executables and packaged source are at http://pdos.org

GPL source for QNAP Turbo NAS

Haiku is an open-source operating system currently in development designed from the ground up for desktop computing.

TiROS (Tickless Real-Time Operating System) is a pre-emptive priority based real-time scheduler (RTOS) that is suitable for use in embedded systems with very limited resources. It provides hard priorities and prevents priority inversion.

Perix is a MS-DOS compatible program, capable of running without an underlining OS. It is written in Turbo Pascal and Assembly. All parts of system are distributed under terms of the GNU General Public License v2.

DOS-C Kernel is an MS-DOS compatible kernel and the original FreeDOS kernel.

This is GIMI, the Graphical Interfaced Multitasking Interpreter. One of the few GUIs made in QuickBASIC featuring multitasking. This one has its own script language for making programs, damm fast SVGA modes, lots of programs, and more!

This site will be a gift to MenuetOS, a 32 bit assembly coded operating system from Finland, Russia and Hungary.

While I may have started with Linux 0.11, I've expanded this to include several older relases of the Linux kernel that you can cross compile from Windows, and run on Qemu. I've managed to get the older versions of the software tools running on Windows, so that there is no major invasive source changes, outside of either broken drivers, or massaging the makefiles to find things in the new paths, and calling the appropriate tools where needed. Linux 0.10 is the first oldest version of Linux that is somewhat usable. While it lacks things like TCP/IP, and robust filesystems, it does offer a small kernel size, perfect for playing around with. You can comfortably make changes on Windows, re-compile and test all from a 'normal' desktop.

EMOS is a real-time embedded operating system core derived/upgraded from ucOS/II; EMOS is a realtime embedded operating system derived from ucOS-II v2.0, with many modifications, But the core idea is the same;

The project is not more active, we have fix a lot of issue and perform many improvements. These are now deliverd as part of a new project: https://github.com/ciaa/Firmware ---- FreeOSEK is a scalable solution for embedded system. FreeOSEK OS is based on OSEK RTOS specification (OSEK-VDX). visit us in: http://opensek.sourceforge.net

FreeOS/1 is a Free, Open Source, FreeDOS based Free and Open Source Alternative OS, with open source Microsoft Windows compatibility using HXDOSExtender KernelEx,and ReactOS source code. FreeOS/1 will include new technologies and will be easy to use

Longene ( Linux Unified Kernel ) is an open source project sponsored by Insigma Co., Ltd. It aims to implement a kernel module in Linux that provides a system-call and driver layer to allow the Windows applications to run on the Linux OS.

BNL OS is a free, modern operating system based on the design of Windows XP/2003.This is not a Linux based system, and shares none of the unix architecture. Please remember, this is in the development stage, and is not reccommended for everyday use.

This is the free Developer Edition of BeOS 5 PE with updated drivers & Software. The Developers are the most important people we needed for the success of BeOS and later OpenBeOS.

A base for programs. Includes algorythms for Q-learning and SOM's etc. too. Examples: Hamron: Simulates evolution, uses the 2D-renderer. DriveUnit: created for school, for a robotic arm, uses the 3D-renderer. Hlearn: http://www.sagenb.org/home/pub/8

Micro-80 aims to simulate a Z80 homebrew computer down to the bare metal: 64K RAM, ADM-3A terminal, parallel port, serial port and...3.5" 1.44MB floppy drive?!

Schillix is a complete OpenSource operating system based on the source code of OpenSolaris.