free stuff that doesnt easily map to the curriculum
http://www.sagemath.org/
http://www.geogebra.org/cms/
http://www.mathslice.com/
http://www.ofset.org/drgeo
http://www.cmu.edu/oli/index.html
http://curvebank.calstatela.edu/home/home.htm
http://csunplugged.org/
http://www.techtrekers.com/sim.htm
http://www.teachers.ash.org.au/jeather/rainforestmaths/RFMG/RFMG.html
http://mathworld.wolfram.com/topics/AnimatedGIFs.html
http://www.fi.uu.nl/wisweb/