Commit Together by Github - Now add co-authors to your commits
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Commit Print - Posters of your git history
Source iOS - The best git client and code editor for iOS.
Macarons - Macarons is your virtual watercooler for casual conversations with colleagues you rarely meet on the hallway.
Git2Go - The Git client for iPhone and iPad you always wanted