FreeMind  1.0.1
Mind mapping and idea tracking

As with other mind mapping software packages, FreeMind allows the user to edit a hierarchical set of ideas around a central concept. The non-linear approach assists in brainstorming new outlines and projects as ideas are added around the mind map.

You can use FreeMind for just about anything - keeping track of projects, a collection of notes with links on some area which expands as needed, or essay writing and general brainstorming.