Website that provides information on writing, including plagiarism prevention
Website that provides an overview of plagiarism issues in the news
Website that lists a variety of copyright articles and issues, updated weekly
Website that provides a variety of information for students and faculty to address plagiarism.
Check your own work; no guarantee as to accuracy, reliability or how the materials will be used. This just lists availability and you should do your own homework to see whether the site works for you.
Grammarly (7 day free trial)
PlagTracker (free vs. premium accounts)
PaperRater (free vs. premium accounts)