iThenticate - Prevent Plagiarism in Published Works
Plagiarism Checker X - We strive to provide the most effective, secure and user-friendly plagiarism checking tool that champions originality: a privacy focused, effective and user-friendly plagiarism detector that merges innovative technology with user needs.
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.
AntiPlagiarist - AntiPlagiarist checks multiple documents for plagiarism.