Well just a raytracer in Visual basic 6, thus the name VB6 raytracer. Not because it is easy or logical, but because it is hard. I know this is not the right language to write a raytracer, see it as a stubborn POC that it is still somehow possible.
VisSim is a visual simulator for semi-stationary objects written in C++. The viewer can move around in three dimensional space to view the object from different directions and distances. VisSim uses OpenGL/GLUT and it runs in client-server mode.