Version Control Rethought
The goal of the Subversion project is to build a revision control system that is a compelling replacement for CVS in the open source community. The software is released under an Apache/BSD-style open source license [1]. Have a look at the book [2].
[1] http://subversion.tigris.org/
[2] http://svnbook.red-bean.com/book.html#svn-ch-1-sect-1
