Jason Bentley has announced a new GDN project called nTeam. In his words:

nTeam will be an open source alternative to Team System, will make use of the open source projects all ready available such as nUnit, nAnt, etc., and will target small- and mid-sized development teams. If you are interested in joining the workspace, join through the project page. I am really excited about this project and hopefully, it will fulfill the needs of those teams feeling shunned by Microsoft.

I can't help but think it should be NTeam though, as I'm sure it's usually NUnit and NAnt. But I guess that's just me be picky, as usual...