LWN has a good summary of the current state of open source forks of the sourceforge codebase. It also announces GForge, a cleaned up version of the last beta that VA Software. GForge is forked from alexandria 2.61pre4. Here’s a good summary of the current state of things:
The Debian project’s Debian-SF package is based on alexandria 2.5, the last full release before VA Software withdrew development code and removed the CVS repository. The “Savannah” fork (http://savannah.gnu.org/) is derived from the v. 2.0 alexandria release code. BeriOS Developer (http://developer.berlios.de/) forked a codebase from a very early alexandria release, maybe v. 1.5. The sf-genericinst and X-Forge projects seem to have died. XoopsForge and GBorg/GBSite are clones, but otherwise unrelated.