Inspiration - this software can be used to created concept maps and other types of graphic organizers very easily. A free 30-day fully functional copy of the software can be downloaded.
The Graphic Organizer - At this site, you will find a variety of materials related to graphic organizing.
Index of Graphic Organizers - At this site, you will find examples of each of these types of graphic organizers: Webbing, Concept Mapping, Matrix, and Flow Chart.
The Theory Underlying Concept Maps and How to Create Them - this article, by the originator of concept maps, Joseph D. Novak of Cornell University, describes what concept maps are about and the educational psychological principle behind their success.
Concept Maps - An Introduction - at this site, you will also find information about Tips on Making Your Own Concept Maps, Kinds of Concept Maps, and a Concept Map Bank.