Grammarly-online proofreading tool that checks text for grammar, punctuation, and style, and features a contextual spelling checker and plagiarism detector.
Free proofreading tool - spelling, grammar, word choice, plagiarism detector
Introduction to Best Plagiarism Detector Tools
Top 8 Plagiarism Detector Tools for Teachers ~ Educational Technology and Mobile Learning
Free plagiarism detector tools for educators... Click on the link towards the bottom for a Google doc with more info on the websites.
Top 8 Plagiarism Detector Tools for Teachers