TUNES Project (Popularity: )
http://tunes.org/ Open source resource for learning about programming languages and operating systems. Led by French OS philosopher Fare'. Some 2,000 links.
BRiX: Advanced Computing Environment (Popularity: )
http://brix-os.sourceforge.net/ Fast, no-kernel, single address space, data-centric, preemptive multithreaded, persistent, secure, multi-user operating system, with Crush function-based programming safe-language. Some code ...