MACSYMAA Computer Algebra System.
From Bibliography on the MACSYMA, VAXIMA and maxima symbolic algebra languages (see below):
MACSYMA, possibly the oldest surviving computer symbolic algebra system, was developed starting about 1968 at the Massachusetts Institute of Technology, using the MACLISP dialect of the Lisp programming language. The name stood for Project MAC's SYmbolic MAnipulation System, and MAC stands for Man and Computer, or for Machine Aided Cognition.
- Maxima at SourceForge under GPL. The original DOE-MACSYMA (Department of Energy's MACSYMA) from which it descends.
- Apparently ScienTek, a Korean company, is still offering support for the commercial version of Macsyma by Macsyma, Inc. (MIA), which went out of business in 1999, according to macsyma.bib (see above).