Grammarly
Not only a plagiarism checker, but also an automated proofreader.
Dupli checker
An online plagiarism checking tool which dissects each sentence individually utilizing authentic data sources.
Plagiarism Checker
After submitting a short phrase from an assignment, the tool connects you with the Google results where the phrase is used.
TinEye
A reverse image search engine that searches for the original location of the image and its modifications.