ORTEP-III, the Oak Ridge Thermal Ellipsoid Plot Program for Crystal
Structure Illustrations is this one.

(1) The program, examples, and online documentation are 
  available on the WWW site at

WWW: http://www.ornl.gov/ortep/ortep.html

(2) If you can use `pgplot' as screen drawing routine, type 

    % make USEPGPLOT=yes

(3) If you are not familier to `pgplot', note the followings:

  Before you use ortep3 with pgplot library, 
  run pgdisp server and setenv PGPLOT_DEV as

    % pgdisp &
    % setenv PGPLOT_DEV /xdisp

  then you can see the ortep-drawing on a pgplot window.

--
rmiya