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I’m confident

You could rule Concept mapping.

I really like it. Not to get too technical, you have here a concept mapping system rather than a plain old mindmapper. This is because you don't enforce a hierarchy between the nodes, but allow any one to link to any other. I think this a very strong idea. All it needs is the ability to use a brief descriptor on the connectors, as many other mapping tools do, and then the world of propositional logic and knowledge will be supported by your tool, and you'll have have a great USP.