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Geometry Playground (v1.3) is a free Java application for doing "ruler and compass" constructions in both Euclidean, Spherical, Projective, Hyperbolic, Toroidal, Manhattan and Conical geometries. Its purpose is to help users develop a familiarity with various conceptualizations of these geometries.

An article that introduces a new type of Web document, the Mathwright Microworld, a "portal" to a multipage, interactive book.
This ESTEEM module in the Biometrics Category describes construction of three simple databases using a spreadsheet. Recommendations for building simple databases using a computer spreadsheet and the statistical analysis of its data are given.
An article that explores visual patterns in Pascal triangles with entries determined by arithmetic in finite groups
These applets and educational materials demonstrate the shapes and parameters for several commonly used discrete and continuous probability distributions. It is part of the Statistics Online Computational Resource (SOCR).
Content classification for mathematics education
This Mathwright Microworld allows a student to look at systems of linear equations as (1) simultaneous linear equations, (2) vector equations, and (3) matrix equations.

An article about an interactive environment for viewing dynamically the geometry of elementary row operations.

This interactive matching game uses Flash to bring to life the standard "reform calculus" problem of matching graphs of function and their (first and second) derivatives.

This mathlet computes the center of mass (centroid) of a lamina of uniform density.