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Wolfram, produces interactive demonstrations of mathematics concepts. The demonstrations can be viewed online, but to make to use the demonstrations interactively you need to download the free Mathematica Player from the Wolfram website. The Mathematica Player is available for Windows, Mac, and Linux environments. Installing the Mathematica Player allows users to download demonstrations and use them interactively on their local computer.
The Wolfram Education Portal for both students and educators, contains a collection of resources spanning all precollege grade levels, including dynamic classroom Demonstrations from The Wolfram Demonstrations Project.
Amschool Web 2.0 Resource 