Runtime.JS – Operating system kernel built on V8
Similar, more mature projects based around other languages:
Erlang: <a href="http://erlangonxen.org" rel="nofollow">http://erlangonxen.org</a>
C#: <a href="http://en.wikipedia.org/wiki/Cosmos_(operating_system)" rel="nofollow">http://en.wikipedia.org/wiki/Cosmos_(operating_system)</a>
C#: <a href="http://en.wikipedia.org/wiki/SharpOS_(operating_system)" rel="nofollow">http://en.wikipedia.org/wiki/SharpOS_(operating_system)</a>