CL
A class library containing various building blocks, e.g., a String class,
a resizeable Array class and a (linked)
List class.
VL
The vector library. Now in its 3rd incarnation, it's pretty well tested
and has had most of the rough edges rubbed off.
GCL
Graphics class library. Offers various handy graphics utilities, including
a scene tree and language support, colour and geometry definitions, an
image class, some basic UI classes, and various vector utilities for
doing such things as intersection tests.
Rad
Radiosity code.
Spike
Ray tracer.