Updated 9-23-20
- Bubblus–simple to use, no log-in, free–but a bit quirky (IMHO)
- Mind42–online, free
- MindMaple—free or fee
- MindMeister–free trial for education
- Popplet—for iPads and the web
- Spicy Nodes
- SpiderScribe–add text, pictures, files; free sign-up
