The MINIX 3 Operating System
http://www.minix3.org/
Pinguy OS
Desktop - News
Today marks the tenth anniversary of the first release of Syllable Desktop, then plainly called Syllable 0.4.0. The original website and announcement are gone, and many other circumstances of the time have changed quite dramatically. We are happy that Syllable is still here - which, judging by comparable ventures, is a feat to be proud of.
Visual Operating System
DesktopBSD: Home
MikeOS - simple x86 assembly language operating system
Haiku Project
The FreeDOS Project
AROS Research Operating System
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