GNU Maxima is a free computer algebra system, written in Lisp and released under the GNU General Public License. It is based on an early version of Macsyma developed at MIT with funding from the United States Department of Energy. Maxima was maintained by Bill Schelter from 1982 until his death in 2001. It is now maintained by an independent group of users and developers.

The GNU TeXmacs mathematical editor program can be used to provide an interactive graphical user interface for Maxima.

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