Softwares 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 their seniors etc 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?