Common LISPcraft Code
The source code for the book "Common LISPcraft" by Robert Wilensky, W. W. Norton & Company; 2nd edition (June 1986). It mostly includes AI and parsing code.
GNU Scientific Library for Lisp
An interface that allows the use of the GNU Scientific Library (GSL) from Lisp. The GSL is a library of applied mathematics commonly used in science and engineering.
A library for fast topological sorting.