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.
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 Geometry Junkyard - http://www.ics.uci.edu/~eppstein/junkyard/polytope.html Comprehensive list of links to sites on geometric properties of the shapes.
Numericana - Polyhedra & Polytopes - http://home.att.net/~numericana/answer/polyhedra.htm Enumeration, cartesian coordinates of vertices, naming, and counting the shapes.
Regular Polytopes - http://www.math.rutgers.edu/~erowland/polygons.html Derivation of volume equations for regular polygons, polyhedra, and polytopes, with images.
The Mathematical Atlas - Polytopes and Polyhedra - http://www.math.niu.edu/~rusin/known-math/index/52BXX.html Collection of discussions regarding volume, vertices, dissection, g-holed tori, and other subjects.
Pick's Theorem - http://www.cut-the-knot.org/ctk/Pick.shtml Describes a theorem for finding an area of simple lattice polygons. Includes proof and Java applet simulation.
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