SVK is a decentralized version control system written in Perl which uses the Subversion filesystem.
TortoiseSVN is a Windows shell extension which adds Subversion information and commands to Windows Explorer.
TortoiseSVN is Subversion for most Windows users. TortoiseSVN brings the full functionality of Subversion into the Windows shell.
There are also some very useful extras. Most notable is the "Repo-Browser" which enables queries and changes to be made directly on the repository.
Versions provides a pleasant way to work with Subversion on your Mac.
Unified SCC adds seamless integration with Subversion/SVN or CVS to your development tools of choice.
The CommitMonitor is a small tool to monitor Subversion repositories for new commits. It has a very small memory footprint and resides in the system tray.
SVN Notifier is a simple and useful tool to monitor your Subversion project repository for changes. SVN Notifier notifies you about recent commits and helps you keep your local copy up to date. You can review all the changes and update your local copy right from the application.
Syncro SVN Client is a cross platform Subversion client written in Java.