TortoiseSVN - The coolest interface to (Sub)version control
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder
Xversion - Super easy enterprise class version control.
SmartSVN - SmartSVN is a graphical client for the Open Source version control system Subversion (SVN).
RabbitVCS - RabbitVCS is a set of graphical tools written to provide simple and straightforward access to the...
kdeSVN - Comfortable graphical SVN client for linux.