I haven't worked on Schemeray for a while, but you can find it at github now. I've really enjoyed using github for project hosting; I get free hosting which I can always depend on, and the git interface is a nice side benefit. I've been meaning to try our their issue tracker as well.
Schemeray (github) is a simple raytracer written first in Gambit Scheme and ported to PreScheme. It supports spheres, planes, triangles, point lights, reflections, and .obj file loading.

