BitBucket is a free and pay-for hosting site specializing in the excellent Mercurial revision control software. At this time, BitBucket has become the most popular place to host open source projects implemented in Cobra. But diversity is good!

•  http://bitbucket.org/
•  http://en.wikipedia.org/wiki/Bitbucket
•  http://www.google.com/search?hl=en&q=bitbucket

See also: CodePlex, GoogleCode?, RelatedProjects