@stobot: It would certainly be possible to use TW5-Graph for mindmapping, but it would be better to use a dedicated mind-mapping library connected to TW5-Graph instead of Vis-Network, which is more about arbitrary graph visualization.
Freemind is unfortunately a java program, and can’t be used, but I looked around at some others. Mind-wired seems like it could work maybe. It’s not a very big project, but it’s designed for mind-mapping (hotkeys, rapid graph development, etc…). I’m sure there are probably others.
