argunet editor - Argunet Editor is a free argument map editor for analyzing and visualizing complex debates.
Freeplane - Freeplane is a powerful and free software for building mind maps.
tutoit.io - Create an in-app measurable tutorial with a single click
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
DebateGraph - Graph visualization of: Join a global community of mappers with over half a million ideas and 30,000 maps. Click on the bubbles to explore, and log-in to create free public & private maps on any topic!
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.