
   Hi

   I would like to know if there is any software, PD or not, who
   could produce X11 output of HPGL file on RS/6000. And same kind of
   software who could produce hardcopy on postscript and lasetjet.

Try export.lcs.mit.edu.  I think that there is a viewer there called
xviewgl.  Check the README in /contrib.


