Mercurial is a fast, lightweight source control management system designed for efficient handling of very large distributed projects. Quick start: http://www.selenic.com/mercurial/wiki/index.cgi/QuickStart Tutorial: http://www.selenic.com/mercurial/wiki/index.cgi/Tutorial Extensions: http://www.selenic.com/mercurial/wiki/index.cgi/CategoryExtensi on