TortoiseGit - TortoiseGit is an easy to use client for the Git distributed revision control system.
Git2Go - The Git client for iPhone and iPad you always wanted
gitg - gitg is a git repository viewer targeting gtk+/GNOME.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
SourceTree - Mac and Windows client for Mercurial and Git.
Working Copy - The powerful Git client for iOS