All the above sites are based on SourceForge engine. Gforge is developed by one of the main architects of SourceForge, Tim Perdue.
SourceForge is no longer open source since version 3.0. The last OS version was 2.6, which has plenty of problems and limitations.
VA Software (formerly known as VA Linux) owns and operate SourceForge, which is part of OSDN. They package SF as a commercial product now.