Turnitin is probably the most widely used commercial software, used by Universities etc. There are a number of free programs, which work in different ways and so have different utilities. You can also just paste sentences into google and see if it matches anything!

Turnitin has one big advantage. it is not only about chasing the bad guys, but also about writing and enhancing originality.

Dear Dr

I think Viper is good for us, because It is software to detect plagiarism

Thanks for all

also there are another links for plagiarism which are good detector

http://www.scanmyessay.com/

http://www.dustball.com/cs/plagiarism.checker/

http://turnitin.com/

http://www.docoloc.de/

http://www.crossref.org/crosscheck/index.html

http://plagiarisma.net/

http://www.ithenticate.com/

http://www.paperrater.com/free_paper_grader#

http://www.duplichecker.com/index.php

http://www.shambles.net/pages/staff/ptools/

M. sarkawt

Viper m haya bas kar nakat

Dear Dr Muher

You should be a member in it by email, otherwise I have it, I can run for you if you want.

Dear M. Sarkawt

I am member In web application program for viper www.viber.com also I have software Viper Plagiarism Scanner with user name and password, but I believe now its not working

best regard