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A set of articles (and some tutorials) about various tools for developers, including GeoGebra, LiveGraphics3D, Java Sketchpad, PHP, and SVG.
This tutorial shows the details of composing the POV-Ray code necessary to generate the image of a dodecahedron, and to animate rotating the dodecahedron.
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.