SourceForge was the first major MongoDB case study — you can check Mark Ramm’s talk about MongoDB at SourceForge. Now they are releasing Allura which uses MongoDB:
Allura includes a customizable ticket tracker, wiki, discussion system, git, mercurial, and subversion. We added email integration to all of these tools, so every artifact has a thread with collaboration from a familiar interface. Extending this platform should be as simple as creating a new tool or mashing up the REST API.
Original title and link: Allura: SourceForge Open Platform Powered by MongoDB (NoSQL databases © myNoSQL)