Fork - Fast and Friendly Git Client for Mac
Working Copy - The powerful Git client for iOS
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
CodeHub - CodeHub is the most complete, unofficial, client for GitHub on the iOS platform.
SourceTree - Mac and Windows client for Mercurial and Git.
Git Flow - Git Flow is a very self-explanatory free software workflow for managing Git branches.