I'll cast my vote for Redmine as well. It is a great improvement on Trac, keeping all the nice features - code repository integration with git, svn etc.; wiki,

I'll cast my vote for Redmine as well. It is a great improvement on Trac, keeping all the nice features - code repository integration with git, svn etc.; wiki, milestones, tickets; plus multiple projects (public/private) with flexible access rights.