I recently rediscovered
Compendium. It’s such a wonderful brainstorming tool. The interface is pretty good, though I do find myself stumbling (particularly when it comes to zooming in and out). What’s really effective, however, is the IBIS techniques for brainstorming. I pick a problem I’m trying to resolve, and make a ‘Question’ node. I come up with some ‘Idea’ nodes, and identify ‘Pros’ and ‘Cons’. I can add ‘Pros’ and ‘Cons’ for the ‘Pro’ and ‘Con’ nodes as well. This helps me to quickly get a big picture view of the problem, which is precious when trying to make a decision.