TortoiseSVN - The coolest interface to (Sub)version control
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder
VisualSVN - VisualSVN - Subversion plugin for Visual Studio
Cornerstone 4 by Assembla - The ultimate Subversion client for Mac
RabbitVCS - RabbitVCS is a set of graphical tools written to provide simple and straightforward access to the...
Xversion - Super easy enterprise class version control.