Apache Subversion™ is an open source version control system.
- TortoiseSVN - highly integrated in Windows explorer (right-click menu, icon overlay, ...)
- SmartSVN - Graphical client for Windows, Mac, Linux
- KDESvn - KDE based GUI client for Linux (and Windows)
- RabbitVCS - Python based client for Linux that integrates with the Nautilus and Thunar file managers and the Gedit text editor
- RapidSVN - WxWidgets based GUI client for Linux and Windows
- Cornerstone - Mac only