A.12. Stellation

"Stellation is an advanced, extensible software configuration management system, originally developed at IBM Research. While Stellation provides all of the standard functions available in any SCM system, it is distinguished by a number of advanced features, such as task-oriented change management, consistent project versioning and lightweight branching, intended to ease the development of software systems by large groups of loosely coordinated developers."

http://www.eclipse.org/stellation/