This blog post discusses Paper Rater. The free tool requires no registration and offers real-time, 24/7 analysis and detailed statistics about your work's originality, your word choice, grammar, spelling,style, word choice, readability. It suggests an overall grade, as well as opportunities for improving your writing.
"At the heart of creating HyperDocs are all of the collaborating and sharing opportunities. Lessen your workload, be inspired by other's ideas and share your lessons by joining Teachers Give Teachers."
Website that will remove the background of a video. You upload your footage and have a choice of backgrounds to replace yours. Takes the place of a green screen.