Toondoo is a great tool that can be used in several situations. For example, after having read a book (reader), students can create the main characters of the story and write a comic strip with them.
I frequently use in my classroom is ViewPure. ViewPure allows you to display YouTube videos without displaying the "related videos" and advertisements that appear next to each video. There are two ways that you can use ViewPure. You can copy the url of your chosen YouTube video and paste it into ViewPure where it will then strip away everything but the video. The other option is to install the ViewPure bookmarklet and click anytime you're viewing a YouTube video.