just for giggles
http://promo.net/madcow/
free 2d &3d grapher download!!
http://www.graphcalc.com/index.shtml
Free trial version of geometry softwar.
http://www..keypress.com/sketchpad/
Free trial version of mathtype
http://www.dessci.com/en/products/mathtype/
hope u like them they are really useful and i i searched hard to find them
NASA GIRL