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LittleOS
New operating system. Goal: to be stable and easy to use. Everyone can join. In Français and English. [Open Source]
http://littleos.free.fr/

ACM Crossroads: Operating Freely
Description of the 3 major, freely available, Unix-like operating systems: Linux, FreeBSD, NetBSD. Crossroads is the student magazine of the ACM.
http://www.acm.org/crossroads/xrds1-3/free.html

Ianix OS
Goal: create multiboot-loadable Unix-like OS with Single Unix Specification v3 compliance, for Pentium 2+, written in Assembly, C. Descriptions, background, status, change log. [Open Source, GPL]
http://www.ian-space.com/ianix/

MacDevCenter
Mac development tutorials, opinion, and discussion from the O'Reilly Network.
http://www.macdevcenter.com/

Linux Journal: Open Source Software for Real-Time Solutions
Compares 2 open source OSs for embedded uses: RTLinux, eCOS by Cygnus.
http://www2.linuxjournal.com/lj-issues/issue66/3576.html