Free online mind map tools

https://miro.com/

• need to sign up with email 
• online whiteboard 
• web based, nothing to install
• how to use (2:55)

https://www.mindmup.com/ (my favorite)

• unlimited mind maps (6:40)
• no need for an account
• can download
• how it works (7:40)

https://gitmind.com/ (9:55)

• you need to download to use it