Bazaar

Bazaar is a version control system that helps you track project history over time and to collaborate easily with others. Whether you're a single developer, a co-located team or a community of developers scattered across the world, Bazaar scales and adapts to meet your needs. Part of the GNU Project, Bazaar is free software sponsored by Canonical.

The top ten reasons for switching to Bazaar are: Version control for everyone, Work offline, Any workflow, Cross platform support, Rename tracking and smart, merging, High storage efficiency and speed, Any workspace model, Plays well with others, Launchpad, Plugins and bzrlib.