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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 is an article describing the author's experiences using the Duke Connected Curriculum materials
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.

Marden's Theorem concerns the relative positions of the roots of a cubic polynomial and those of its derivative. This article gives a proof of Marden's theorem, along with dynamic geometry animations and some of the history of the result.

A Developers' Area article about reuse and interoperability of mathematical tools.

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.
These applets provide interactive student activities to make connections between the graphical and analytical interpretation of "completing the square" and writing the equation of a parabola in general and standard form.