Temple OS is an operating system by Terry Davis, a Third Temple, and a revelation. I think this is an important project that should not be forgotten. When I get to creating my own computing environment, Temple OS will be a big source of inspiration.
It has its own hypertext medium that lets you embed three dee models. Impressive!
Programming language: Holy C.
Links
Temple OS is mentioned quite often on Hacker News, actually.
Sadly, this is satire.
The article is about Emacs, not the subject. But it mentions Temple OS briefly.