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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.
This note introduces a new wiki devoted to "Better Practices for Presenting Mathematics on the Web." This wiki is an outgrowth of a workshop with the same name held July 15-21, 2007 in Washington, DC.
An introduction to Volume1, Issue 2
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.
A mathlet that allows the user to input a sequence of 0's and 1's of length 20 and then tests the sequence for randomness using three different tests.
An interactive module to study numerical and graphical solutions of differential equations in first-semester calculus.

A set of articles (and some tutorials) about various tools for developers, including GeoGebra, LiveGraphics3D, Java Sketchpad, PHP, and SVG.

A Biological ESTEEM module in the Ecology Category. This workbook models the growth of two populations: phage and the bacteria they infect.