VisualSVN - VisualSVN - Subversion plugin for Visual Studio
TortoiseSVN - The coolest interface to (Sub)version control
Xversion - Super easy enterprise class version control.
SnailSVN - Similar to Tortoise SVN for Windows but integrated into Finder
RapidSVN - CollabNet, Facilitating Collaborative Software Development
SmartSVN - SmartSVN is a graphical client for the Open Source version control system Subversion (SVN).