Xmind - Xmind is a brainstorming and mind mapping application.
Freeplane - Freeplane is a powerful and free software for building mind maps.
MindNode - Delightful Mind Mapping for your Mac, iPad and iPhone. MacCapture Your Thoughts. Any idea starts with a loose collection of .
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
OmniOutliner - OmniOutliner is a writing app for collecting information, outlining ideas, adding structure to any sort of writing.