Apps similar to CommitMonitor include SVN Notifier, which is free and open source. Other options are Vercue. Between them they cover Windows.
SVN Notifier monitors your Subversion project repositories for changes. It notifies about other people's recent commits and helps keep the local copy up to date. One can review all the changes and update the local copy from the application.
Rich SVN GUI. Let's you control all svn working-copies from a single location, featuring a rich user-interface, accessible source-control operations and highly-visible status icons, messages and notifications.
