- Wallpaper Groups - plane symmetry groups.
- Fractal Instances of the Traveling Salesman Problem - contains resources on the evolving field of the generation of instances of combinatorial optimization problems with known optimal solution.
- VRML Geometry Teacher - helps students visualize 3D objects.
- Native American Geometry - a physical, proportional geometry that originates from the simple circle. Art and mathematics seemlessly integrated in Nature's geometry, emphasizing multiple intelligences and multi-cultural instruction.
- Mathlab.com - Java applet providing virtual straightedge and compass for online interactive geometry.
- Isard - downloadable, interactive geometry software package written in Smalltalk.
- Peek - a program to interactively visualize arbitrary n-dimension polytopes through the use of cross-sections and projections.
- Geometry of the Sphere - provides basic information about spheres, looks at Girard's Theorem, and proves Euler's formula.
- Visual Dictionary of Special Plane Curves - including description, history, formulas, properties, and links for each.
- Diamond Theory - symmetries of black-and-white tilings throw light on combinatorics and group theory.
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