Backend system for skinz.org/deskmod.com?

I've been searching for a week for a script similar to the backend systems used on sites such as skinz.org and deskmod.com. I'd like to adapt their user review/rating systems to allow my visitors to rate class courses and professors. Does anyone know if there's a complete script available like this somewhere that I can setup and use? I'm not a php developer so making something like that is impossible for me. Please help. I think something like this could be adapted for reviewing anything and would be great if it could be shared. Thanks