SourceTree - Mac and Windows client for Mercurial and Git.
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.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
gitg - gitg is a git repository viewer targeting gtk+/GNOME.
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
Aurees - A Git client for Windows, Mac and Linux.