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Free and open source Mind mapping and brainstorming software. Very rich in features compared to freemind (aslo free), a little clunky compared to mindjet ($349), but at no charge. You do need to keep in mind that all the functions that come with the "pro package" which works as a yearly subscription are in the menu's to constantly remind you about the possibility to upgrade to a paid version, hence the class B status.

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Pligg is an open source content management system that lets you easily create your own social network.