WordItOut (13+, Parent permission required if under 13, high)
WordItOut An attractive arrangement of randomly positioned words, where the most important words are bigger than the others. They are fantastic at summarising large documents (reports, speeches, questionnaires, etc), teaching kids and more. You can type in your words, sentences or paragraphs. You can also copy and paste documents and reports.
WordItOut allows users to make word clouds. Saving and downloading the clouds does require an email address, so this would work best for students with email account.
Some classroom applications include brainstorming to see what words come up most often, or maybe having students copy a report and paste it into the text box to see if there are overused words involved in the text. Teachers can copy and paste verbage from content text to give a review for exams.
Here is one example: http://worditout.com/word-cloud/42623
Blabberize (filtering, elementary, middle, high, parent-permission-required-under-13)
Using individual accounts, Blabberize allows users to give photos a voice. Users can save their finished product as an mp4, embed it, or link to it.
Classroom applications could be to use Blabberize to highlight key vocabulary or concepts in any subject.
Click here for a sample.
Popplet (13, filtering, not searchable, middle, high)
Popplet allows users to create interactive graphic organizers and mind maps. Users can import images and YouTube videos (will need to carefully select these), annotate images, and add text. If you share a popplet, you will be given a random url that is public and can not be unshared. While this is fine for teacher use, I would not advise this option for students. Students can embed, export as a jpeg or pdf and print it. (This tool is also a free iPad app: Popplet Lite).
Here is an example highlighting technology tools:
Here are some screenshots of other activities that you can do: