[chriseidhof]

I use gitosis, and it's very simple to set up and manage. It doesn't feel like overkill at all.

[balac]

I like Gitolite, it has more fine grained permission control and is pretty simple to get up and running.

[Gonzih]

I was using Gitosis, now i switch to Gitolite, it's better and simpler.

[davvid]

Gitolite is also well supported. Gitosis is basically an abandoned project. kernel.org's new git infrastructure will be using gitolite which means you can pretty much count on it being supported well into the future.