MindMapping
Mindmapping is a technique to help one organize thoughts and ideas. Its another way a student could show she understands a concept. MindMeister is one such tool for use with a browser.
Audience: Any age
Level of Complexity: Simple
Technology Needed: A browser. You can try it out at https://www.mindmeister.com/. The free version allows up to 2 mindmaps.
Who has used it and can help you: Ann Mariano
Here are some samples:. MindMaps don't have to be done with tech but there are some good apps out there.