GitX is very nice
I’ve been learning to use Git , but today I’m a bit more excited about it after setting up GitX on my MacBook. I’ve been using source management systems for a long time, but rarely have I found such a useful visual tool for garnering such a detailed overview of the commit streams.
To check out the tool, I suggest just pulling down a copy of the git source , install GitX, and then drop the folder where you cloned the git source repository onto GitX. You will be amazed!
 Git package for OS X 10.5.x can be found here.
 git clone git://git.kernel.org/pub/scm/git/git.git