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iThenticate - Prevent Plagiarism in Published Works
Turnitin - Turnitin is preferred by educational institutions around the world for preventing plagiarism. Instructors at all levels of education can request that students use the service to submit papers, and Turnitin checks those papers for plagiarism.
PlagScan - The Internet makes plagiarism a bigger problem than ever.
SCRiBBR Plagiarism Check - This plagiarism check uses the best of both worlds.
PlagiarismSearch - PlagiarismSearch is online service that detects plagiarized content.
Copyscape - Copyscape is a free plagiarism checker.