gitg - gitg is a git repository viewer targeting gtk+/GNOME.
Sublime Merge - Fast git client with integrated merge tool from the makers of Sublime Text
Giggle - Giggle is a graphical frontend for the git content tracker (think of gitk on GTK+).
Bit - Easily share reusable components between projects and applications to build faster as a team.
git-cola - git-cola is a powerful GUI for git, a distributed revision control system.
Fork - Fast and Friendly Git Client for Mac