Alternative - Coggle

MindMeister

mindmeister.com

Mindomo

mindomo.com

Weebly

weebly.com

Happeo

happeo.com

3D Slash

3dslash.net

Sketchboard

sketchboard.io

Allo

allo.io

Nulab

nulab.com

Piconion

piconion.com

Awesome Table

awesome-table.com