This is the subject of a lot of my current research. The suggestions above are good places to start. I would add the Juxta tool to the mix. Like Ridolfo's, this is a DIFF solution. With texts where the traces are minor or have been moved around, the DIFF breaks down. At the moment we are working with an open source plagiarism detector that will run on a 64-bit Linux machine: SuperFastMatch. There is no easy web solution yet because of the nature of the computation. The SuperFastMatch library needs all resources in one PC for example. Hope this helps.
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