Cabri Java beta version  
   Create dynamic geometrical figures using Cabri and publish them as Java applets.
   http://www.cabri.net/cabrijava/

Cabri Geometry  
   The home site for Cabri Geometry, a dynamic geometry package .
   http://www-cabri.imag.fr/index-e.html

Edu2000's Visual Geometry Series  
   A visual learning environment (full-curriculum, Mac/Windows) that helps students explore and understand geometry.
   http://www.education2000.com/educational_cdroms/educational_cdroms.htm

C.a.R. Geometry Program  
   A free program allowing Compass and Ruler constructions. Now also available in Java.
   http://mathsrv.ku-eichstaett.de/MGF/homes/grothmann/car.html

Dave Wilson's Poincaré Notes  
   A page describing some Cabri macros relating to hyperbolic Geometry in the Poincare disc model.
   http://s13a.math.aca.mmu.ac.uk/Geometry/Poincare/Poincare_Notes.html

Singular  
   Computer algebra system for polynomial computations. Free download.
   http://www.singular.uni-kl.de/

TTC  
   Mathematica package for doing tensor and exterior calculus on differentiable manifolds.
   http://baldufa.upc.es/ttc/

Descriptive Geometry  
   Software for creating and printing drawings, including conicsections, color fillings in Monge's projection and axonometry.
   http://www.volny.cz/plavjanik/dge.html

Great Math Programs  
   A collection of mathematical programs, with particular reference to geometry.
   http://www.xahlee.org/PageTwo_dir/MathPrograms_dir/mathPrograms.html

Cinderella: Interactive Geometry  
   Cinderella is a Java based interactive geometry tool. The only available tool that gives correct solutions to typical geometrical problems.
   http://www.cinderella.de/

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.
   http://www.geocentral.net/polyhedron

Ricci  
   A Mathematica package for doing tensor calculations in differential geometry.
   http://www.math.washington.edu/~lee/Ricci/

MowMowMow's Cabri Room  
   Many Cabri files aimed at high school level geometry.
   http://www.mowmowmow.com/math/cabri/index_e.htm

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.
   http://www.keypress.com/sketchpad

Geometria  
   A Java program in solid geometry. Solids can be measured, cut, drawn upon. 60 sample problems with resolutions.
   http://geocentral.net/geometria

Home Page of Isard  
   A free dynamic geometry package for Windows, PowerMac and Linux. Like Cabri, but in Smalltalk (and smaller). Source available : you can extend it as needed !
   http://www.jeannot.org/~js/isard/

Math Forum: Search geometry-software-dynamic  
   Users of geometry software programs like Cabri Geometry II may share tips and advice at the geometry-software-dynamic discussion list.
   http://mathforum.org/discussions/epi-search/geom.software-dynamic.html

Atomic Concepts Software  
   Freeware for the visualization of atomic structure and process in the cosmos.
   http://atomicconcept.united.net.kg/index.html

Symmeter  
   An on-line tool for understanding and measuring symmetry.
   http://www.symmeter.com/

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.
   http://www.gang.umass.edu/software/

Mac Spirographic  
   Apple Macintosh (OS 8.6-OS X) freeware program for drawing, printing, and exporting spirograph patterns. Includes related links.
   http://www.databrevity.com/macspiro/

WinGCLC  
   a tool for describing geometric constructions and making digital illustrations in LaTeX and bitmap format.
   http://www.matf.bg.ac.yu/~janicic/gclc/

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.
   http://www.mit.edu/~ibaran/kseg.html

Riemann surfaces visualisation  
   Unifpack is a set of programs and C libraries designed to help in the study of Riemann Surfaces.
   http://www.geom.uiuc.edu/apps/unifweb/about.html

KwikTrig  
   A free trigonometry solving program for Windows.
   http://www.fracaro.net/kwiktrig.htm

GeomNet  
   Family of geometric computing servers execute a variety of geometric algorithms on behalf of remote clients, which can be either users interacting through a Web browser interface or application programs connecting directly through sockets.
   http://loki.cs.brown.edu:8081/graphserver/

GEUP  
   An interactive geometry program for Windows. Evaluation version free to download.
   http://www.geup.net/index_eng.htm

Qhull for convex hulls, etc.  
   Qhull for computing the convex hull, Delaunay triangulation, Voronoi diagram, and halfspace intersection about a point.
   http://www.qhull.org

GEUP - Interactive Geometry software.  
   GEUP is an interactive geometry tool. Lets you dynamically explore Mathematics, build mathematical models of real world or create interactive mathematics presentations.
   http://www.geup.net

Riemannian Geometry & Tensor Calculus @ Mathematica  
   Free Mathematica package for explicit tensor calculations in Riemannian Geometry.
   http://www.inp.demokritos.gr/~sbonano/RGTC/

Rite Item  
   Geometrical shareware software. Anyangle (Windows/DOS) finds answers to problems involving triangles. Partydot creates patterns.
   http://www.riteitem.com/

UVModeller  
   A java applet that lets you input a surface function and view the surface interactively in real time.
   http://www.geocities.com/hirak_99/java/uvmodeller.html

Lissajous Figures by Geo Doubek  
   Applet that draws the famous Lissajous Figures, with mathematical explanations about it, by Geo Doubek.
   http://www.angelfire.com/falcon/geodoubek/