Douglas Zongker | Polyhedra Models
Geometric Paper Folding: Dr. David Huffman
Paper Airplace - The Best Paper Airplane - How to build it
Vinicius F. Arcaro homepage - Software for shell and tension structures
 

Javascript design sites:

Spacecraft in vacuum, atmospheric spacecraft, multi stage spacecraft, and spacecraft cost.
Bipropellant rocket, tripropellant rocket, pumped rocket, and rocket cost.
 

The following sites are incomplete:

Balloon, sulloon, rockoon, and blimp cost.
Circular ship, moving ship, and ship cost.
Skin boat, moving boat, and boat cost.
 
 

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