A mind mapper, and at the same time an easy-to-operate hierarchical editor with strong emphasis on folding. These two are not really two different things, just two different descriptions of a single application. Often used for knowledge and content management.
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Unfortunately it doesn't have top-bottom diagrams, and for this only reason I have to use the non open source xmind. Hope to see this option sooner or later... I'm checking for it once in a while.
Good thing there are some documentation because this is my first time using a mindmapping software. Finally replacing pen and paper, so i still need to get used to it, overall its pretty easy to follow and use if you just have patience
FreeMind is an excellent open-source mind map. I've been using it for years to manage my research and writing projects.
Very easy to use, arranges things very well. Can be a bit glitchy.