Cabri Geometry (Popularity: ): The home site for Cabri Geometry, a dynamic geometry package . C.a.R. Geometry Program (Popularity: ): A free program allowing Compass and Ruler constructions. Now also available in Java. Singular (Popularity: ): Computer algebra system for polynomial computations. Free download. TTC (Popularity: ): Mathematica package for doing tensor and exterior calculus on differentiable manifolds. Descriptive Geometry (Popularity: ): Software for creating and printing drawings, including conicsections, color fillings in Monge's projection and axonometry. Cinderella: Interactive Geometry (Popularity: ): Cinderella is a Java based interactive geometry tool. The only available tool that gives correct solutions to typical geometrical problems. Polyhedron (Popularity: ): 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. Ricci (Popularity: ): A Mathematica package for doing tensor calculations in differential geometry. MowMowMow's Cabri Room (Popularity: ): Many Cabri files aimed at high school level geometry. The Geometer's Sketchpad Resource Center (Popularity: ): 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. The Open Problems Project (Popularity: ): A project to record open problems of interest to researchers in computational geometry and related fields.