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Platonic Solids
(Cabri 3D figures)
Cube
How to make a cube by folding up a net.
Rotation, Cross sections and other explorations of Regular Dodecahedron
Regular Octahedron
Is this regular?
Truncate a polyhedron to make some Archimedean solids
Other resources on Regular and Semi-regular Solids
Poly
Shapescape
Stella
Kali and KaleidoTile  
The Many Faces of Polyhedrons  
iMath Investigation: Geometric Solids Tools and suggested lessons  
Drawing in Polyhedra : an applet in Wisweb  
construct lines and planes in a regular polyhedron
Eric Swab Visualization of Space