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.
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Urkund - Detect and check for plagiarism with URKUND
PlagiarismSearch - PlagiarismSearch is online service that detects plagiarized content.
AntiPlagiarist - AntiPlagiarist checks multiple documents for plagiarism.