Maxima

GNU Maxima is a free computer algebra system, written in Lisp and released under the GNU General Public License.

Maxima is based on Macsyma, which was developed at MIT with funding from the United States Department of Energy. A version of Macsyma was maintained by Bill Schelter from 1982 until his death in 2001. In 1998 Schelter obtained permission from the Department of Energy to release his version under the GPL. That version, now called Maxima, is 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.