Mindmeister is an online, collaborative mind-mapping tool that give students (and teachers) an opportunity to organize their thoughts, brainstorm, and collaborate with just a few clicks.
One feature that teachers are finding very useful is the history feature. By clicking the “Toggle History View” icon in the lower right corner, they can view the history of the map, from start to finish by playing it like a video or clicking to a particular point of development. Additionally, if several people have collaborated to make the map, each person’s contribution is color-coded so teachers know which students contributed what material or ideas.
This is just one feature of a very robust and useful tool for the classroom. For a quick tutorial on how MindMeister works, watch this video.