The Persistence of Vision Raytracer is a
high-quality tool for creating 3D graphics. It is
available in official versions for Windows, Mac
OS/Mac OS X, and i86 Linux.
Stereograph is a stereogram generator that renders exclusively truecolor stereograms. It offers different effects to increase the quality of your artwork, including transparency effects.
GTKstereograph is a GTK interface to stereograph, a stereogram generator. This package includes the current renderer but does not yet support all features (i.e. transparency).