The DICT Development Group

  Calc
  
      An extensible, advanced desk calculator
     and mathematical tool written in Emacs Lisp by Dave
     Gillespie .  Calc runs as part of GNU
     Emacs.  You can use Calc as only a simple four-function
     calculator, but it also provides additional features including
     RPN+({stack">choice of algebraic or RPN ({stack-based) entry,
     logarithms, trigonometric and financial functions, arbitrary
     precision, complex numbers, vectors, matrices, dates, times,
     infinities, sets, algebraic simplification, differentiation,
     and integration.
  
     FTP calc-2.02.tar.z from your nearest GNU archive site.
  
     (2000-10-20)