A free Git client for Windows and Mac. It offers most of the features that all the best paid Git clients do but SourceTree is completely free. It's made by Atlassian so integrates nicely with Bitbucket as well.

Simple for beginners
Say goodbye to the command line - simplify distributed version control with a Git client and quickly bring everyone up to speed.

Powerful for experts
Perfect for making advanced users even more productive. Review changesets, stash, cherry-pick between branches and more.

Visualize your code
Seeing really is believing. Get information on any branch or commit with a single click.

Git and Hg on your desktop
A fully-featured GUI that offers an efficient, consistent development process right out of the box. Works with Git and Mercurial.