From Academic Answers:
Our anti-plagiarism software is used by teachers, lecturers and students worldwide to detect instances of plagiarism in academic work, such as essays, dissertations and pieces of coursework. Are you a student? Use the software to find out: if you've missed a reference, or incorrectly cited a sentence; if you've mixed notes from a book or journal in with your own; if you've plagiarized, even accidentally, a piece of your own work. Are you a teacher/lecturer? Use the software to find out if a student has: cheated by plagiarizing off the Internet; plagiarized a piece of their own work; copied work off of a friend, or other pupil. Can you afford not to use our free plagiarism scanner? Now you can select a writer to proofread, edit or grade your essay from within Viper, directly.