Bazaar is an implementation of GNU arch in C from canoncial. Arch is a version
control system, which allows you to keep old versions of files and directories
(usually source code), keep a log of who, when, and why changes occurred, etc.,
like SVN, CVS, or RCS. Arch is distributed, which gives it significant
advantages and some disadvantages compared to SVN and CVS.

WWW: http://bazaar.canonical.com/