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Syllable Desktop is a complete operating system that is easy to use, powerful, lightweight and extraordinarily fast and responsive. It has its own kernel, filesystem, GUI and applications. Syllable Server is a matching small and efficient Linux server.520 weekly downloads
Haiku is an open-source operating system currently in development designed from the ground up for desktop computing.148 weekly downloads
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 use7 weekly downloads
The new system
A fork of the QEMU emulation system to allow all people to run multiple OS systems from a main system drive or partition such that they can provide their OS machines with whatever degree of direct hardware access or emulated hardware access needed.
This project is an implemenation of a 2d graphics engine for posix complient and the gnosis system.
Slick Linux by Cellocity Based on Fedora Core 6. Using the Kernel 2.6.18. with only basic core elements needed to operate. Slick is just that it's slick because it's striped down. It will have full compiling and running features. It will come with YUM.
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.
open source analogue of IBM OS/2 operating system