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http://demonstrations.wolfram.com/
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The Wolfram Demonstrations Project A growing collection of interactive illustrations is created by Mathematica users from around the world who participate by contributing innovative Demonstrations. Anyone can preview a Demonstration online, and interact with it using the free Mathematica Player (http://www.wolfram.com/products/player/). Those with Mathematica software (not free) can also experiment with and modify the code on their own computers. Very extensive collection By jgordonin Science and Math > MATH ONLYwith challengedifferentiateddifferentiationillustrationsinteractivemath