TortoiseSVN - The coolest interface to (Sub)version control
SmartSVN - SmartSVN is a graphical client for the Open Source version control system Subversion (SVN).
VisualSVN - VisualSVN - Subversion plugin for Visual Studio
Xversion - Super easy enterprise class version control.
RabbitVCS - RabbitVCS is a set of graphical tools written to provide simple and straightforward access to the...
RapidSVN - CollabNet, Facilitating Collaborative Software Development