From help-octave-request at che dot utexas dot edu  Sun Jun  5 18:07:13 1994
Subject: Re: So what do u use for symbolic algebra?
From: U-E59264-Osman Buyukisik <buyukisik_o_f at ae dot ge dot com>
To: spaz at u dot washington dot edu
Cc: help-octave at che dot utexas dot edu
Date: Sun, 5 Jun 94 19:02:10 -0400

Try jacal from the usual GNU places. Does not do integration, and it
is scheme based (portable). PNUMAX (used to be called MAXIMA) is not
totally free (need to pay ~$160 for universities) but is a complete
system including plotting , de,tensors, diff forms, etc. Could be used
with any Common Lisp (CLISP, AKCL, ...).
The last one I know is the emacs calc which is not bad.
Hope this helped.
Osman