MACSYMA (Project MAC's SYmbolic MAnipulation System) is a large computer algebra system for symbolic and numerical computations. Originally MACSYMA was developed by the MATH lab group at M.I.T. The descendants of MACSYMA (circa 1982) fall into two camps, viz., the commercialized Symbolics MACSYMA and its successor from Macsyma, Inc., and the versions released to National Energy Software Center at Argonne, Illinois, which are based on the "public" MIT source code for the DEC PDP-10 MACLisp system. The latter ones do not have the Symbolics enhancements, but they have been modified from time to time by several individuals or groups.
One of these modifications is known as PUNIMAX. It is a CLISP-based implementation. CLISP is a Common Lisp implementation by Bruno Haible and Michael Stoll (Univ. of Karlsruhe). PUNIMAX is actually based on MAXIMA, a Common Lisp implementation due to William F. Schelter at Texas University, which itself is based on the original implementation of Macsyma at MIT.
PUNIMAX is not public domain code. A license should be obtained from
ESTSC - Energy Science & Technology Software Center
P.O. Box 1020 Oak Ridge TN 37831-1020
Currently their charge for 1 machine is $165 to universities. Site licenses are also available. The current version of MAXIMA 4-155. After having obtained the license from ESTSC, the software can be downloaded from
ma2s2.mathematik.uni-karlsruhe.de : /pub/math/punimax/punimax.tar.z