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Call it brainstorming, concept mapping or mindmapping, collecting and organizing thoughts using web 2.0 is a snap. Let’s take a peek at several free options.
5 nice tools to brainstorm, mindmap, conceptualize, collect etc. and share it with others e.g. students
Overzicht (Engelstalig) van een 5-tal gratis mindmaphulpmiddelen.
It seems that laying out a graphic organizer for specific topics should be obvious. The resources listed here will get you started. They also present the opportunity for a teacher to draw on their features to have learners create their own mind maps.
A great basic list. You need to look at the comments to get more brainstorming tools