GEUP.net - An interactive geometry tool. It lets you dynamically explore Mathematics, build mathematical models of real world or create interactive mathematics presentations. KSEG Interactive Geometry Software - KSEG is an Open Source program for interactively exploring geometric constructions which can be used to teach geometry in the classroom or for personal enjoyment. WinGCLC - a tool for describing geometric constructions and making digital illustrations in LaTeX and bitmap format. Ricci - A Mathematica package for doing tensor calculations in differential geometry. Singular - Computer algebra system for polynomial computations. Free download. Qhull for convex hulls, etc. - Qhull for computing the convex hull, Delaunay triangulation, Voronoi diagram, and halfspace intersection about a point. Cabri Geometry - The home site for Cabri Geometry, a dynamic geometry package . Great Math Programs - A collection of mathematical programs, with particular reference to geometry. Cinderella: Interactive Geometry - Cinderella is a Java based interactive geometry tool. The only available tool that gives correct solutions to typical geometrical problems. Polyhedron - Interactive application for solid geometry with 250 built-in problems. Simulates ruler, compass, protractor and other tools. Solids can be cut, displayed differently, rotated, joined again. MowMowMow's Cabri Room - Many Cabri files aimed at high school level geometry. The Geometer's Sketchpad Resource Center - This Resource Center supports users of The Geometer's Sketchpad "Dynamic Geometry" software. Contents include a freely-downloadable demo and Java versions; research bibliography; online activity guide; technical support center. Geometria - A Java program in solid geometry. Solids can be measured, cut, drawn upon. 60 sample problems with resolutions. Symmeter - An on-line tool for understanding and measuring symmetry. GANG Software Suite - A set of mathematical environments for computing, visualizing and experimenting with geometric objects; built with the OpenGL/Mesa library and the GTK+ user interface. Riemann surfaces visualisation - Unifpack is a set of programs and C libraries designed to help in the study of Riemann Surfaces. KwikTrig - A free trigonometry solving program for Windows. Riemannian Geometry & Tensor Calculus @ Mathematica - Free Mathematica package for explicit tensor calculations in Riemannian Geometry. Lissajous Figures by Geo Doubek - Applet that draws the famous Lissajous Figures, with mathematical explanations about it, by Geo Doubek. Archimede Geo3d - Software for interactive geometry in three dimensions. In English, French and German.