Freeplane - Freeplane is a powerful and free software for building mind maps.
Linktree - Connect your audience to all of your content with just one link.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Carrd - Simple, responsive one-page site creator.
Pencil Project - Single-user mockup / wireframing / diagramming tool
ContactInBio - Offer More Contact Options To Your Followers