Before you enter:
Now there are two 3D graphics programs
available from this site. Select one.
NEW : Mesh++ http://www.raczynski.com/img/mesh.htm
NOTE the NEW feature of Mesh++ : now it can import/export STL files.
Use ImgMan to create images composed by geometrical 3D figures, textures etc. Includes high resolution viewer.
Mesh++ can be used to create 3D arbitrary shapes by the deformations of "mesh" surface.