Git GUI

Overview of GIT GUI clients:
http://theappleblog.com/2009/03/10/using-git-with-os-x-6-tools-to-get-you-up-and-running/

Source control systems

In order to select a good source control system for your organization, please make sure to read following articles. If you need assistance in deciding, we can be of help.

Warning: There is a difference in between Source Control, Version Control, Lifecycle management system, … make sure not to mix those up.

Now the article (gone already).

Another good source is Forrester research.