SourceTree is native Mac OS X GUI client for managing Git and Mercurial distributed version control repositories. To celebrate Atlassian's acquisition of SourceTree, they're currently making it available for free. Either
- download the demo and apply for a license; or
- download it directly from the Mac App Store.
It's available for a "limited time", so I'm not sure when the offer will expire.
I might as well download it, I mostly use github and the github client for OSX is great but I guess this might come in handy if I ever need to work with another git host.