
			GNU-calc

					phr@telebit.com (Paul Rubin)

It runs inside GNU Emacs and is written entirely in Emacs Lisp. It does the 
usual things: arbitrary precision integer, real, and complex arithmetic 
(all written in Lisp), scientific functions, symbolic algebra and calculus, 
matrices, graphics, etc. and can display
expressions with square root signs and integrals by drawing them on
the screen with ascii characters.  It's nowhere near as powerful as
something like Mathematica, but it is more convenient to use for
simple things because of its calculator-like interface.  It comes with
a 600 page online manual which is generally well written.  You can ftp
the package from your favorite GNU distribution site.

