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GITK - The GITK - Generalized Interface Tool Kit is a set of libraries, which form a (user) interface...
SourceTree - Mac and Windows client for Mercurial and Git.
OctoDroid - Mobile GitHub client for Android.
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
Sublime Merge - Fast git client with integrated merge tool from the makers of Sublime Text
Source App - Source is a simple client for working with git.