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MacHg - MacHg is a free open source OSX GUI for the revision control system Mercurial.
Aurees - A Git client for Windows, Mac and Linux.
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
gitg - gitg is a git repository viewer targeting gtk+/GNOME.
SourceTree - Mac and Windows client for Mercurial and Git.
Qgit - Qgit is one of the smart tools that implement a GUIO for the most common SIGT commands like pop, push, shave and apply matches, making the developer browse revision tree, view patch content, or change files.