I really like Redmine. It's got source integration, a wiki, a task manager, multi-project support, can email notifications, has different user levels and great

I really like Redmine. It's got source integration, a wiki, a task manager, multi-project support, can email notifications, has different user levels and great permission configuration, and also provides time-tracking out of the box. IIRC, it also has a forum and other features that we never used.