- GSLL - The GNU Scientific Library for Lisp (GSLL) allows you to use
- lisp-matrix - A matrix linear algebra library for common lisp building on work by Mark Hoemmen, Evan Monroig, Tamas Papp and Rif
- MatLisp - MatLisp is a BLAS and LAPACK linear algebra library wrapper which makes their features accessible through a set of CLOS classes
- NLISP - NLISP is an environment for numerical computation and visualisation like IDL or Matlab

matrix

Packages for matrix algebra. AJ Rossini wrote a nice summary about some of these packages.