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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 in which the focus-locus, focus-directrix, and cone-slicing descriptions of ellipses are related by way of the space-time geometry of special relativity.
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 on Group Explorer, a system that uses graphical representations of groups to build intuition.

A mathlet to construct an antiderivative by accumulating area under the graph of a function.
This activity illustrates the process of random number generation and simulation. It is part of the Statistics Online Computational Resource (SOCR).
A mathematical model for the number of subscribers to two competing cable TV companies is presented. An applet is included, allowing the user to experiment with the model.
The Mathematical Association of America has found the new Editor to succeed David Smith as the Editor of JOMA.
This Flash Forum entry provides instructions and source code for a simple 3D plotter using PaperVision3D in Flex. The basis of the applet is ActionScript 3. The tutorial is composed of two videos and links to supporting files.
This server-side application allows the user to enter a list of U.S. cities and gives several standard approximate solutions to the TSP problem for the set using great circle distances for weights.