Software to create repositories of students' software projects I want to be able to store the software projects my students submit so I can catch plagiarism. Some students copy work from previous years and it would be really helpful if I could find a way to store all projects so I could compare. 

My university currently uses moodle but I can't find a way to create a project repository to detect plagiarism. (We do have the JPlag detection system but that only works for projects submitted under one particular group (assignment)).  

Any ideas?
I and my university have used MOSS (Measure of Software Similarity) by Stanford (theory.stanford.edu/~aiken/moss) - I'm not sure of its effectiveness to detect slight modifications, but it seems to be the standard of most university CS programs.