http://www.kwiki.org/)Wiki with a Subversion backup backend
http://subissue.tigris.org/)Track issues directly in your Subversion repository
http://subwiki.tigris.org/)Wiki that uses Subversion for its data repository
http://svk.elixus.org/)Decentralized version control system based on Subversion
http://www.rocklinux.org/submaster.html)System for distributed software development, based on Subversion