3rdDimensionOnline: polyhedral art for sale: clothing, cards, etc.
Rudiger Appell: some very nice animated GIFs
Helmer Aslaksen: great photos and links for polyhedral model building
Dr. B's Science Basics: high-quality ball and stick wooden polyhedral models
Ellin Beltz: templates, statistics, and links about the Platonic solids
Blaze Labs: one of the more interesting sites on the Platonic solids including historical and philosophical aspects
Alexander Bogomolny, Cut-The-Knot, Regular Polyhedra: a well organized site designed for teachers
Paul Bourke: lots of statistics on Platonic solids
Jill Britton: an extensive list of resources and activities
Convex Polyhedra 1: Some nice explanations of the mathematics of polyhedra with nice graphics.
Robert Dawson: some models that nicely show the relationship between the icosahedron and the golden rectange
EnchantedLearning.com: information and templates for making paper models
GeometryCode.com: This link is to some exceptionally nice folding patterns but the site contains all kinds of good information.
George W. Hart: good coverage of dual pairs
Vi Hart: a wonderfully creative and imaginative presentation of recreational mathematics
Ron Knott: relates the Platonic solids to the golden section, phi
MathPages.com: extensive information about the Platonic solids
MathSisIsFun.com: information, interactive models, and instructions for make paper polyhedra
mathsnet.net: interactive applet shows how nets fold together to build Platonic solids
National Library of Virtual Manipulative: includes interactive duals and slices of Platonic solids
Pedagoguery Software: They make interactive polyhedral software and a nice poster.
Polydron is a nice snap-together plastic construction kit for building polyhedra.
RND Modelshop-Geometrics: Ron Nelson makes and sells exquisite handcrafted wooden models of goemetric solids.
Science U: a very nice collection of interactive applets
Gian Marco Todesco: an applet that allows you to inscribe platonic solids inside eachother
Uncle Dan's Octa-Tetra Construction Set is a very nice folded-paper kit for building oct-tet truss models.
The University of California: Prof. John Baez: explains extension of Platonic solids into four and higher dimensions
The University of Utah: Prof. Peter Alfeld: information and applets on the Platonic solids
Dan Sewell Ward: some nice information and graphics on the Platonic solids including history
Maurice Starck, The Polyhedral World: a beautifully designed site packed with information.
Whistler Alley Mathematics: rigorous mathematics of formulas behind Platonic solids
wikipedia: extensive information on the Platonic solids
WolframMathWorld: extensive information and bibliography on the Platonic solids
Wolfram Polyhedron Explorer: an interactive polyhedron applet
Douglas Zongker: templates for paper models of Platonic and Archimedean solids
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This site and all of its contents were created by Dan Radin unless otherwise stated.