There are many ways students can organize their thoughts for writing, taking notes, or putting facts into a visual format.
Popplet is a versatile app. It can be used to take notes, create mind maps, build vocabulary, sequence events, categorize, connect ideas and concepts, and more. You can add text, images and drawings to the popplets, and either email the popplet or save it as a jpg.
Mindomo offers a site that students can bubble or mindmap, take notes, and best of all collaborate with peers.