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GaryOS is an entire GNU/Linux system in a single bootable file9 weekly downloads
Gebix is a FreeBSD-based operating system that will be available for both x86 and ARM as of version 0.7 Release Candidate 1. It will sacrifice most of the legacy support to transition to new or recent alternatives.7 weekly downloads
Venom Operating System. A protected mode kernel for i386+ PC's. Designed for games and multimedia.3 weekly downloads
Copy and paste this address into your browsers URL http://www.anarchyproject.com2 weekly downloads
XSystem Kernel Project - an object-oriented 32-bit protected-mode operating system for IA32-architecture.1 weekly downloads
The Trion Object Oriented Operating system is an OS that is designed to meet the needs for the 21st century, with a kernel written in C++ and modelled in UML, and lots of features. The project is run by a team of OSDev.org community members.1 weekly downloads
DragonFly is an operating system and environment designed to be the logical continuation of the FreeBSD-4.x OS series. These operating systems belong in the same class as Linux in that they are based on UNIX ideals and APIs. DragonFly is a fork in the pa
A FOSS operating system that aims to meet NSA's TPEP TCB A1 evaluation standard while retaining application compatibility at minimal performance overhead.
RedBrick project tries to bring the best commonly available open source software pieces like linux 2.6, lustre, sleepycat, mysql, tipc,openais and others available in the above paradigms together as a integrated single downloadable cluster image. T
Turtle OS is an Unix-like OS. It aims to be open source, secure, high performing and portable.