Sublime Merge - Fast git client with integrated merge tool from the makers of Sublime Text
GITK - The GITK - Generalized Interface Tool Kit is a set of libraries, which form a (user) interface...
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
OctoDroid - Mobile GitHub client for Android.
ForkHub - GitHub client for Android based on the abandoned official app
Thermal - All-in-one place to manage your Git repository.