Tools for drawing math figures

http://www.maa.org/editorial/mathgames/mathgames_08_01_05.html

I would like to try at least one or two programs in the category of "geometry exploration programs."

Office for Mac

http://www.ciac.org/ciac/techbull/CIACTech02-003.shtml
It's funny that MS uses this stupid scheme to detect pirate software.