3flex is a prototypical knowledge map editor. People less
inclined to use buzzwords have formerly called software like that
"graph editors". Download it, read doc/usage.txt for things that
(should) work and doc/issues.txt as well as doc/todo.txt for things
that do not quite. The short-term goal is to make it bug-free, the
mid-term goal to produce something comparable to Tinderbox with a strong connection to Vanilla (and probably similar systems) and the long-term goal, as always, world domination. Disclaimer: Not for people who experience writer's block upon appearance of empty spaces.