iThenticate - Prevent Plagiarism in Published Works
PlagScan - The Internet makes plagiarism a bigger problem than ever.
Plagramme - Our plagiarism checker recognizes paraphrased plagiarism, checks your paper against more that 14 trillion documents and lets you to edit your paper online.
PlagiarismSearch - PlagiarismSearch is online service that detects plagiarized content.
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.
Urkund - Detect and check for plagiarism with URKUND