Does anyone have a recommendation for an open-source or paid (either packaged or SaaS) solution for integrating collaborative development features into your own website? Here's more details:

We currently host an online plugin gallery for our product. Users can upload and download plugins. But users can't easily collaborate on a plugin's development, can't easily report and track bugs on a plugin, can't easily track a plugin's versions or roadmap, etc.

Of course, contributors can host their plugin development on github, sourceforge, google code, codeplex, etc. But keeping users on our website has some advantages. For example:

• We can use single-sign-on to avoid yet another username/password required
• we can integrate end-user issue tracking into our existing online issue-tracking systems
• we can get integrated analytics so we can better meet the needs of top contributors as well as downloaders
• We can easily reward reputation points to committers just like we do for people who answer lots of questions

Anyone know a good solution for white-label sites for open-source project developer collaboration?