Java programs to download, developed by M. Szilvási-Nagy :

• For children: modeling a truncated pyramid: [link]
• Program (Compoly) for learning 3D modeling by composing truncated pyramids: [program]
• Let's construct the plane sections of a solid: [program + help]
• Visualizing the vector operations: [program + help]
• Visualizing basis transformations: [program + help]

Generalized Polygonal Wankel Engines (by Emil Molnár and Jenő Szirmai)

Crystallographic Groups of the Plane (by István Prok)

Symmetric Polyhedra (by István Prok)

Uniform Polytopes (by István Prok)

Visibility of 4-Dimensional Regular Polytopes (by Emil Molnár and István Prok)