Guy's Polyhedra Pages
- http://www.queenhill.demon.co.uk/polyhedra/
- Vertex figures, filling, faceting diagrams, stellation, defining polytopes through generators, trimethoric and trisynaptic polyhedra, space-filling polyhedra, lost stellations of the icosahedron, and links.
The Charged Particles Model
- http://presh.com/hovinga
- Polytopes and optimal packing of p points in n dimensional spheres. Includes a java applet based on a model which allows for generation of multidimensional regular and semi-regular polytopes.
Zome Edu
- http://www.zometool.com/educators.html
- Educational toys used to teach geometry and model building to create squares, spheres, stars and other regular shapes with sticks and connecting pieces. Products include kits and lesson plans.