[Br1c3]

Not sure what features you are looking for, but Textmate has a Git Bundle that gives you access to a pretty good range of git functions. (It's what I use for all of my non-cmd-line or github git interactions)

http://blog.macromates.com/2008/git-bundle/

GitNub OSX:

http://github.com/Caged/gitnub/wiki

There is also GitK