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Contains online books and research papers on categorical geometry and categorical algebra.
http://www.geometry.net/
Java applet providing virtual straightedge and compass for online interactive geometry.
http://mathlab.com/
a physical, proportional geometry that originates from the simple circle. Art and mathematics seemlessly integrated in Nature's geometry, emphasizing multiple intelligences and multi-cultural instruction.
http://www.earthmeasure.com/
just print and fold.
http://www.korthalsaltes.com/
interdisciplinary differential geometry research team.
http://www.gang.umass.edu/