Ivan Bach <ib@sgi.com> collected some testimonials from a number of
  SGIers:

  - Adobe Illustrator and Corel Draw can edit PS files of type AI (a
    simplified version of PS that facilitates editing).

  - Transverter (from TechPool, 212-291-1922) can convert some general
    PostScript files to AI PostScript. It also does other conversions,
    e.g. to TIFF.

  - If you have DPS and the DPS developer's kit you can do this quite
    well with xfig. Check out the version in
    ftp://ftp.x.org/contrib/R5contrib-fixes/xfig-patches/.

  - The InterViews tool `idraw' allows manipulation of EPS
    (Encapsulated PostScript) files, and has a `mac-type' interface.

  - Island Draw 3.0 has an option to import Postscript, and it seems to
    accept arbitrary Postscript.  I have fed it single page Postcript
    files from Illustrator, Corel, Ventura, Designer, Eroff, and
    hand-coded files, and it made Island Draw objects out of them.  The
    file initially opens as one grouped object, but if you ungroup, you
    get editable objects.  I was quite impressed.  I don't doubt there
    are ways to fool the interpreter, but it works for output from
    drawing and publishing packages, which is what I need it for.

  - Jack Howarth <howarth@nitro.med.uth.tmc.edu> adds: ps2ai.ps converts
    Postscript to AI Postscript. It requires ghostscript (see above).
    aimaker is a front end to ps2ai.ps. Both programs can be found in
    ftp://toby.princeton.edu/pub/olszewsk/.