I recently saw an article about the growing problem of plagiarism among students and so I've written a little piece of software as a tool to aid teachers in the fight against it. The application is called Collusion and allows users to select a folder on their hard drive that contains the students' essays. These are then checked against each other for evidence of "copy-and-paste".
This is version 1.0. All feedback, via the contact form or the Nimisis software Google group, would be greatly appreciated!