I’ve just discovered a nice piece of FREE software for designing paper models.
JavaGami :- is a software environment for designing paper models using polyhedra and user-created variants of polyhedra.
http://l3d.cs.colorado.edu/~ctg/projects/hypergami/JavaGami.html
Check out the "Gallery" to see what has been created using it.












I downloaded this, but can't figure it out. Does it have an instruction manual?