Edpuzzle accesses videos from YouTube, Kahn Academy, Learn Zillion, Ted Talks Veritasium, Numberphile, Crash Course, and Vimeo. What makes edpuzzle really useful is that it allows you to crop the videos you want to show. Show as much or as little of the video as you would like. You can also use voice over to add your own comments and observations. Edpuzzle is compatible with Google Classroom.