Free CopyScape Alternatives

In the late 2009 I ever posting about Dupefree Pro - Free Tool To Check Duplicate Content (Copyscape Alternative), but for now it seem this software not free anymore, Below are some website that you can use to check the duplicate article for free:


- http://plagium.com/
- http://www.articlechecker.com/
- http://www.dustball.com/cs/plagiarism.checker/
- http://duplichecker.com/index.asp

Please comment below if you have another free software to check duplicate content like copyscape :-)