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This ESTEEM module in the Biometrics category creates graphical images of a certain type of fractals (Iterated Function Systems) that can be constructed by linear transformations.
A Developers' Area article on the use of Java Sketchpad to construct and publish interactive Web pages.
A mathlet to explore approximation of the definite integral by Riemann sums
This is a pair of (1D and 2D) SOCR Activities that demonstrate random sampling and fitting of mixtures of Gaussians to model complex data (e.g., multimodal).
This applet, designed as a limited computer algebra system, allows the user to evaluate mathematical expressions, including those of interest in a calculus class.

An article on the use of technology to stimulate mathematical thinking even by the least likely students

This mathlet simulates a predator-prey system of foxes and rabbits over time.

This article explores how mathematical techniques, digital images, and dynamic geometry software can be used to analyze a real-world situation originating from poultry science. The topic is mathematical modeling of the shape of an egg, where the underlying question is: What is the volume and surface area of a hen's egg?"

This utility uses the free Flash player plug-in resident in most browsers to allow the user to plot 3D curves and surfaces on a customized scale and dynamically rotate the picture.
A preparatory module for problem-solving in physics and calculus that covers systems of units, dimensional analysis, significant figures, estimation, and orders of magnitude