Subversion "SVN" is a version control system, 
see http://subversion.tigris.org/ and http://en.wikipedia.org/wiki/Subversion_(software)

Currently (2007-01) at version 1.4.3

See also: http://tortoisesvn.tigris.org - Subversion client
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[tkcvs] as of version 8.0 now supports Subversion in addition to CVS.

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[Category Dev. Tools]