From Maple to MuPad - A conversion tool by François Thomasset. Written in OCaml, free under GPL. - http://www-rocq.inria.fr/~thomasse/Maple-MuPad/
SciFace Software - Developers and distributors of MuPAD. Documentation and downloads. - http://www.mupad.com/
MuPAD - Open computer algebra system for symbolic and numerical computations. Library routines for linear algebra, integration, polynomials, and graphics. Can generate and be called from C or Fortran code. Free download by FTP for personal research purposes: req - http://www.mupad.de/