Th svnX open-source GUI client for Mac OS X provides support for most features of the standard svn client, including working with local working copies as well as a useful remote repository browser. It supports all Subversion versions from 1.4 through to 1.7 and is the best open-source GUI Subversion client for Mac OS.
Cornerstone is a fully-featured native Subversion client, designed specifically with the Mac OS X GUI look-and-feel. It is a commercial application that is also available on the MacAppStore.
Another commercial Mac OS X Subversion GUI is Versions. A 30-day demo version is also available.
Mac OS X includes a Subversion command-line client as part of the standard operating system installation. Open the Terminal application and type svn with the required parameters. Easy.
The latest version of the Subversion command-line client is available from the MacPorts community-supported collection of open-source software.
Subversion support is included in Apple’s powerful Xcode Integrated Development Environment. For many developers this is the perfect compliment to the Mac OS X command-line tools.
Eclipse is a cross-platform IDE that also supports Mac OS X. The Subclipse plug-in provides Subversion support. It uses JavaHL to integrate with the command-line tools, so a little bit of manual installation and configuration is required.