Plagiarism Checkers

http://copyscape.com/

http://www.doccop.com/index.html?nc=0.18362667

http://www.plagiarismdetect.com/

http://www.reprintwriters.com/copyright-checker/check.php

http://info.icopyright.com/

http://www.attributor.com/

http://www.plagium.com/index.cfm?mode=text

http://www.plagiarismtoday.com/stopping-internet-plagiarism/1-how-to-find-plagiarism/

blogpost:

http://www.searchenginejournal.com/top-online-plagiarism-checkers-protect-your-content/7931/