SCRiBBR Plagiarism Check - This plagiarism check uses the best of both worlds.
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.
iThenticate - Prevent Plagiarism in Published Works
Plagiarisma - Plagiarisma.Net is a free online plagiarism checker and duplicate content finder.
Urkund - Detect and check for plagiarism with URKUND
Plagramme - Our plagiarism checker recognizes paraphrased plagiarism, checks your paper against more that 14 trillion documents and lets you to edit your paper online.