Git-Cola is recommended for developers who prefer using a GUI over command-line, beginners who are just starting with Git and would benefit from a more visual approach, and users who work on smaller projects where the simplicity and speed of Git-Cola can be fully utilized.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
GITK - The GITK - Generalized Interface Tool Kit is a set of libraries, which form a (user) interface...
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
SourceTree - Mac and Windows client for Mercurial and Git.
Giggle - Giggle is a graphical frontend for the git content tracker (think of gitk on GTK+).
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.