TkCVS is a Tcl/Tk-based graphical interface to the CVS and Subversion configuration management systems. It will also help with RCS. TkDiff is included for browsing and merging your changes.
TkCVS shows the status of the files in the current working directory, and has tools for tagging, merging, importing, exporting, checking in/out, and other user operations.
TkCVS also aids in browsing the repository. For Subversion, the repository tree is browsed like an ordinary file tree. For CVS, the CVSROOT/modules file is read. TkCVS extends CVS with a method to produce a "user friendly" listing of modules. This requires special comments in the CVSROOT/modules file.
Although TkCVS now supports Subversion, it will still work happily without it in your CVS directories. It didn't abandon CVS, it just grew some new capabilities.