Subversion

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Subversion (SVN) is a version control system initiated in 2000 by CollabNet Inc. It is used to maintain current and historical versions of files such as source code, web pages, and documentation. Its goal was to be a mostly-compatible successor to the widely used Concurrent Versions System (CVS).

Free Version Control with Subversion book.

SVN-Trac tutorial by John Simpson using RPMs for CentOS 5.

http://trac.edgewall.org/wiki/TracSubversion
http://recurser.com/articles/2007/02/19/installing-trac/