Maxima's development history spans three distinct periods: The research project at MIT, the stewardship of William Schelter and the current Maxima project. MACSYMA (Project MAC's SYmbolic MAnipulation System) was developed by the Mathlab group of the MIT Laboratory for Computer Science (originally known as Project MAC), during the years 1969-1972. Their work was supported by grants NSG 1323 of the National Aeronautics and Space Administration, N00014-77-C-0641 of the Office of Naval Research, ET-78-C-02-4687 of the U.S. Department of Energy, and F49620-79-C-020 of the U.S. Air Force. MACSYMA was further modified for use under the UNIX operating system (for use on DEC VAX computers and Sun workstations), by Richard Fateman and colleagues at the University of California at Berkeley; this version of MACSYMA is known as VAXIMA. William Schelter developed and maintained this version, Maxima, from the project's inception until his untimely death in 2001. We are eternally grateful for his enormous contribution. William Schelter thanked the following people for having tested the code under various common lisp implementations, and for helpful comments: hagiya%kurims.kurims.kyoto-u.junet%utokyo-relay.csnet@RELAY.CS.NET (in kcl aosv) steve@spock.ncsa.uiuc.edu (Steve on sun/franz common lisp) spar!malcolm@decwrl.dec.com (malcolm) sun/lucid raible@orville.nas.nasa.gov (Eric Raible on iris(kcl)) fateman@peoplesparc.Berkeley.EDU (Richard Fateman) In November, 2001, the Maxima project moved to the Sourceforge project hosting site. As of April 2007, the Maxima developers are: James Amundson Jorge Barros de Abreu Jay Belanger David Billinghurst Marco Ciampa Douglas Crosher Robert Dodier Andreas Eder Andrey Grozin Yasuaki Honda Stavros Macrakis Camm Maguire Volker van Nek Mario Rodriguez Riotorto Juan Pablo Romero Bernal Dan Stanger Viktor Toth Raymond Toy Jaime Villate Andrej Vodopivec Barton Willis Cliff Yapp Vadim V. Zhytnikov Former developers as of April 2007: Mike Clarkson Steve Horne Judah Milgram Paulo Ney de Souza Sergey Semerikov Wolfgang Jenkner Maxima also includes contributions from: Michel van den Bergh Karl Berry Salvador Bosch Pérez Fedor Bezrukov Fabrizio Caruso Ari Constancio Gosei Furuya Juan Pablo Hierro Álvarez Vadim Konovalov Tim Moore Guenther Nowak Kostas Oikonomou Edmond Orignac Valerij Pipin Jose Ramirez Labrador Ole Rohne Thomas A. Russ Marek Rychlik Starting with version 5.9.0, Maxima uses mk::defsystem and (slightly modified) run-lisp from the Common Lisp Open Code Collection, <http://clocc.sourceforge.net>. The nregex code was written by Lawrence E. Freil.