CodePlex is a free, open source project hosting site from Microsoft.

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

Note that at this time, BitBucket has become the most popular place to host open source projects implemented in Cobra. But diversity is good!

See also: IDESupport, BitBucket, GoogleCode?, RelatedProjects