GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Qgit - Qgit is one of the smart tools that implement a GUIO for the most common SIGT commands like pop, push, shave and apply matches, making the developer browse revision tree, view patch content, or change files.
SourceTree - Mac and Windows client for Mercurial and Git.
gitg - gitg is a git repository viewer targeting gtk+/GNOME.
Fork - Fast and Friendly Git Client for Mac
Git2Go - The Git client for iPhone and iPad you always wanted