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Freeplane - Freeplane is a powerful and free software for building mind maps.
Visual Understanding Environment - Visual Understanding Environment (VUE) is a mind-mapping and concept-mapping tool.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Flying Logic - Highly visual software for planning support used by strategists, process improvement specialists, teachers, and writers. Windows, Mac OS X, and Linux.
OmniOutliner - OmniOutliner is a writing app for collecting information, outlining ideas, adding structure to any sort of writing.
ThinkComposer - Software for create adaptable and multilevel diagrams, concept maps, mind maps and models