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A fork of ReactOS which aims to be compatible to the NT architecture (but not a clone) meeting WINE's standards every time a part of NT interface is implemented. The fork was done at revision 9494 before ReactOS changed slowly into Tinykrnl.2 weekly downloads
An open source operating system for x86.1 weekly downloads
Blueport is an italian Open Source 32-bit operating system ... This project has temporarly moved to Gna.org: <a href="http://gna.org/projects/blueport">Blueport project</a>1 weekly downloads
THIS PROJECT IS INACTIVE!!1 weekly downloads
A unix like operating system with complex but fun ways.
G/Linux is a set of tools, profiles and specifications to build linux distributions.
MightyOS is a serious attempt at making a fast and lightweight Operating System written in C++.
Story OS is a small microkernel system with object-oriented service interface.
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.
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!).