This looks pretty nice for one-off design work. But for those who want to maintain something like a knowledge base (and a desktop app), check out Scapple and iM

This looks pretty nice for one-off design work. But for those who want to maintain something like a knowledge base (and a desktop app), check out Scapple and iMapping. In particular check out 0:13 in this video (https://youtu.be/bTQWL5wmdZY?t=13 https://youtu.be/bTQWL5wmdZY?t=13)