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This Math Flash Forum Sharing Area applet provides students with practice with polar coordinates and the radian measure of angles through a simple, interactive game.
This Java applet allows the user to experiment with Riemann sums. It can also be used to approximate definite integrals or find upper and lower bounds to the exact value of a definite integral, using Riemann sums.

The use of JavaMath is explained via an example and ideas for new types of web service are discussed.

about JOMA
Useful for teaching as well as artistic endeavors, this applet allows the user to build a "seed" for a recursive process that constructs complex and fascinating fractal images.
This site includes two applets, one for visualizing the approximation of a square wave by trigonometric series, and the other for hearing successive approximations to the displacement curve of a sound wave.
A mathlet for exploring reflected and refracted images
This article gives a brief account of the learning material to be found at the maths online website.
Trying to make Flash work
This utility uses the free Flash player plug-in resident in most browsers to allow the user to plot parametrically defined surfaces in spherical coordinates. Many examples and directed exercises are included.