Rather than having 4 people write another graphics package for Maxima
to replace the packages that exist (I don't know if they work, but Xmaxima
plots for me..), why not write something that doesn't already exist.
Having just looked at the list of product offerings from Mathworks
(vendors of Matlab), why not pick your favorite toolkit and see what
you can do symbolically. e.g. signal processing, control systems,
financial computations, pdes, ....
RJF