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SmartGitHG's name sucks hard but it's close to SourceTree feature-wise: http://www.syntevo.com/smartgithg/index.html

SmartGitHG is a nice alternative, but it does cost money ($79), while SourceTree is being given away for free (as a way to push BitBucket).

I would love to see a Linux version of SourceTree, but it may be a while. As was pointed out by one of their employees before, they write each application as a native app for each OS to provide the best possible experience, so adding a new OS means adding a lot of work.

While it is not the same of course, I love the Nautilus integration of RabbitVCS.

Of course if you don't use a DE with nautilus ymmv.

git-cola is quite full-featured on Linux (and OS X (and Windows)).

I recommend grabbing the latest git-cola rather than the one in your package manager if you use Ubuntu.

The newest git-cola is so much more feature rich and cleaner in comparison.

git-cola rocks!