See also

http://elearningindustry.com/top-10-free-plagiarism-detection-tools-for-teachers

Take a look at:

http://www.checktext.org

This examines your text not only for plagiarism but also for analytics and statistics.

More answers at following thread:

https://www.researchgate.net/post/How_to_find_similarity_index2

Turnitin.com works very well. It generates a similarity percentage that will be low if the work submitted is original. Hope this helps.

Thank you everybody....really helpful info.

Please download PlagiarismCheckerX_2015 by using the below link and use it to improve your paper !

https://drive.google.com/a/usmba.ac.ma/file/d/0ByNPgOEzijZRSFBWWVZiQlU3akk/view?ts=578b726d

Also visit the Noplag Plagiarism Checker website http://noplag.com/ which will detect and mark the quotes, references and text matches against the web. Works fast, provides easy-to-understand result and will be of some help.