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ReactOS Synthesis Project (RSP) is aimed at combining a Microsoft Windows installation with ReactOS system files, so as to replace and complement/extend functionality. The advantages range from fixing issues to implementing desired functionality.
A Free and Open Source Operating System by SamyPesse Version Actuelle: 10.04 Web-Site: http://myos-os.org [French Only]1 weekly downloads
Haiku is an open-source operating system currently in development designed from the ground up for desktop computing.62 weekly downloads
MightyOS is a serious attempt at making a fast and lightweight Operating System written in C++.
FOS - open source 32-bit microkernel operating system.
Artificial-life and robotics development environment and simulator involving neural networks, 3D physics, vision, and evolutionary programming.
Can emulate old computer on text the code pogram ideal to create kernel for operating system The begin the project the can emulate CPU(8080)and z80.
StepOS is an open-source operating system that is designed solely to run StepMania, the popular 'dance simulation game', on arcade dedicated cabinets, and is easy to install and maintain. StepOS is based off of the open-source operating system ReactOS.2 weekly downloads
MDF is microkernel operating system. Module architecture minimalistic design.1 weekly downloads
This an open SVN for the Ascent Emu were people can take it for free. From here you can download the World Fast Developing WoW Emu
RimX is a very small run in memory linux distribution dedicated to live performance using recent linux technologies (jack/lash) and "small" audio/midi tools like seq24/patchage/omsynth/...
Jinx is a minimalistic graphical operating system for use on old computers with 64MB RAM. Suitable for desktop,business,library use. Includes browser, office applications in 50MB ISO. Optimized for tiny size.7 weekly downloads
The main goal of this project is to provide open source alternative to proprietary operating system used in Motorola p2k mobile phones(not smartphones).
Story OS is a small microkernel system with object-oriented service interface.
Kudu is a free, open source operating system. It is being written in ASM/C++, using NASM and g++ as compilers. We should have v0.1 out by the end of January 2008. 0.1 will have a working kernel and several working shell commands, including a timer.
An open-source alternative to Apple Mac OS X. Intended to comply completely with the OPENSTEP specification. Written in Objective-C. Kernel based on FreeBSD.1 weekly downloads
Pearwin is a unix like operating system, written in C, C++, Assembly, and other languages. This is a hobby/home OS, designed for home use, but can be professional (if you can find an application!).
Metano Linux is a GNU/Linux distribution made to run in mobile devices and PDA's.1 weekly downloads
librestep is a progressive effort to produce a free, modern and stable OS distribution. To get librestep download and configure TOR and GNUnet then follow the onion link. Bug tracking, SCM, support forums, and some documentation is housed here.
Jinx OS Is An Up-And-Coming 64Bit OS.1 weekly downloads
Open Platform for Wireless and Internet Devices
The project purport to create THE FIRST AUTOPILOT FOR CARS, using a technology called Intel OPENCV and Linux.
This is an operating system, starting with with a simple "Hello, World" OS and eventually develop into 2 stages: 1. Run Windows Drivers and software plus OS X software with an OS X Install DVD. 2. Run Windows and OS X software within its own code.
(Main Project) The Independent Innovative Free-Libre Open-Source Software public project's mission is to create, as an open community, the perfect conceptually new feature-complete free-libre open-source operating system from scratch.