Overview
Atlassian Sourcetree is a free Git and Mercurial client for Windows.
Atlassian Sourcetree is a free Git and Mercurial client for Mac.
FSDict
Dictionary access to a filesystem, for serializing things that are too large to be pickled together, or even shelved, or that you with to version control more cleanly than shelve will allow.
Since googling this project name, I've found a cleaner implementation by Ian Bicking that I should probably base my own small innovations on.