A simple CVS client that bypass any firewall blocking port 2401 used by cvs. It relies on the ViewCVS web interface to the repository to work. To use when all other solutions (SSH...) fail
PVC (PhpVersionControl) is a port of CVS to PHP. It features a shell version and a web interface that has all the features of CVS (i.e. commit, checkout, etc.), in an easy to use web interface.