PlagiarismSearch - PlagiarismSearch is online service that detects plagiarized content.
Plagramme - Our plagiarism checker recognizes paraphrased plagiarism, checks your paper against more that 14 trillion documents and lets you to edit your paper online.
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.
SCRiBBR Plagiarism Check - This plagiarism check uses the best of both worlds.
ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.
Plagiarisma - Plagiarisma.Net is a free online plagiarism checker and duplicate content finder.