Geometry Games - numerous games. Many on 3D visualization.
Cyberchase Point of View Game - Draw the side views for each of four people.
Cut-outs, Nets - This applet folds a 2D net into a 3D object. Click and drag to manipulate the object/net.
Cube Nets - A net is a two-dimensional figure that can be folded into a three-dimensional object. Which of the nets below will form a cube?
Platonic Solids - Investigate the five Platonic solids (tetrahedron, cube (hexahedron), octahedron, dodecahedron, and icosahedron). Rotate the shape. Shift-click the edges and the faces to color (and count them). Can you make V - E + F = 2? (vertices - edges + faces = two)
Platonic Solid Duals - Investigate the solids and their duals. The dual of a solid is formed by taking the midpoint of each face and making these midpoints the vertices of the new (dual) solid. For the dual, faces become vertices and vertices correspond to faces.
Truncate, Expand,
Snubify - This is amazing! From the five platonic solids, you can get many of the Archimedean solids using these three processes. Very interesting.
