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TortoiseSVN - The coolest interface to (Sub)version control
SmartSVN - SmartSVN is a graphical client for the Open Source version control system Subversion (SVN).
kdeSVN - Comfortable graphical SVN client for linux.
VisualSVN - VisualSVN - Subversion plugin for Visual Studio
WebSVN - Online subversion repository browser
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder