Commit Together by Github - Now add co-authors to your commits
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
SourceTree - Mac and Windows client for Mercurial and Git.
Source iOS - The best git client and code editor for iOS.
Git Force - Git Force is one of the powerful tools that allow you to push changes in the commit history, making it free not to line with new or anyone in the future.
Git2Go - The Git client for iPhone and iPad you always wanted