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This is an article describing the author's experiences using the Duke Connected Curriculum materials
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 reuse and interoperability of mathematical tools.
This application allows randomized Venn Diagram review and self-testing implemented in Flash.
This straightforward Java applet parses statements from propositional logic and displays their truth tables in a format consistent with most discrete math texts.
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.

A mathlet that illustrates the relationship between the graphs of the natural sine and cosine curves and the vertical and horizontal coordinates of points on the unit circle.

Chemical Graph theory is used to model physical properties of molecules called alkanes. Java applets allow for interactive exploration of molecules. A student project and discussion of its application are included, along with spreadsheets of model data.

This applet uses the free Flash player plug-in resident in most browsers to allow the user to plot a parametrically defined curve on a customized scale and dynamically rotate the three-dimensional picture.