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This Flash Forum article includes source code and modification instructions that will allow you to customize a grapher for polar and parametric curves in the plane.
This is an article describing the author's experiences using the Duke Connected Curriculum materials

This article discusses parameterized knots (polynomial and trigonometric) and includes an interactive gallery of selected knots and their equations.

This ESTEEM module in the Ecology Category consists of an Excel workbook that allows the diversity of a biological population to be estimated with both the Shannon and Simpson biodiversity indices based on information theory.

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 developing reusable components in Java.
Flash CS3 (Actionscript 3.0) templates and classes for graphing functions in one variable as well as parametric curves in rectangular or polar coordinates.
This Java applet plots up to 10 functions simultaneously with zoom and trace features. It can be used to study properties of functions or approximate solutions to equations. The syntax for entering the functions is given on the accompanying web page.
Gauss-Kronrod Integration is an adaptation of Gaussian quadrature used on some graphing calculators. This Java applet outlines the mathematical computations involved and visually demonstrates the process the calculator uses to evaluate the integral.
This module a standard model of population growth in a constrained environment.