GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
Tower - Build Better Software. Over 100,000 developers and designers are more productive with Tower - the most powerful Git client for Mac and Windows.
SourceTree - Mac and Windows client for Mercurial and Git.
gUmi - Manage infinite Git profiles in one click
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.