Curio

Curio screenshots

Easily keep track of your new ideas, project plans, and to-dos.
Curio 11.4 : Sleuth Window

Alternative downloads

SimpleMind
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Easy-to-use Mind Mapping tool that turns your Mac into a brainstorming, idea collection and thought structuring device....
Note-C
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App for collecting notes, snippets, and any other piece of text.
Mind Architect
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This application lets you create mind maps on your Mac.