Bit - Easily share reusable components between projects and applications to build faster as a team.
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...
Giggle - Giggle is a graphical frontend for the git content tracker (think of gitk on GTK+).
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
git-cola - git-cola is a powerful GUI for git, a distributed revision control system.