Glatt Plagiarism Services
http://www.plagiarism.com/
Sells software tools related to plagiarism. The Glatt Plagiarism Screening Program eliminates every fifth word of the suspected student's paper and replaces the words with a standard size blank. The student is asked to supply the missing words. The number of correct responses, the amount of time intervening, and various other factors are considered in assessing the final Plagiarism Probability Score.
The Glatt Plagiarism Self-Detection Program (GPSD) is a Web-based screening program that can help detect inadvertent instances of plagiarism. You can enter 100 words of an essay and it will remove every fifth word, giving you the opportunity to fill in the blanks, and will then score how well you remembered the original.
Plagiarism.org
http://www.plagiarism.org
This site is designed to provide the latest information on online plagiarism and explain how our their portal, Turnitin.com, is now being used by educators all over the world to fight plagiarism.
A free trial of this program is available at http://www.turnitin.com/free_trial.html
EVE2
http://www.canexus.com/eve/index.shtml
Fee-based service that checks students' papers and returns reports to faculty. A free 15-day trial is available.
WordCHECK KeyWORD Software
http://www.wordchecksystems.com/
Software that allows instructors to develop and maintain keyword profiles of classroom essays and helps determine re-use of previously submitted assignments.
The Web's Plagiarism Police
http://www.salon.com/tech/feature/1999/06/14/plagiarism/print.html
An interesting article about one person's experiences with some of these online plagiarism detection tools.