Ghostscript is distributed by the Free Software Foundation and includes a
PostScript interpreter and a library of graphics primitives.  Version 2.6.2
is now available; version 3.0 will include a full implementation of
PostScript Level 2.  Sources are on
ftp://prep.ai.mit.edu/pub/gnu/ (pick up
ghostscript-fonts-2.6.2.tar.gz as well). Related goodies are at
ftp://ftp.cs.wisc.edu/ghost/gnu/ . [6/96]

GhostView (by Tim Theisen, tim@cs.wisc.edu) is full-function user interface
for GhostScript.  Sources are on
ftp://prep.ai.mit.edu/pub/gnu/ and
ftp://ftp.cs.wisc.edu//ghost/gnu/ghostview-1.5.tar.gz binaries for various
architectures are at ftp://ftp.cs.wisc.edu/ghost/gnu/ghostview-exe/ .

GSPreview (by the Computing Laboratory of the University of Kent at
Canterbury) is an X user interface (WCL-based) to the Ghostscript 2.4-2.6
interpreter.  The source is available for anonymous ftp from ftp.x.org as
gspreview.2.4.tar.Z [9/94] or from
ftp://unix.hensa.ac.uk/misc/unix/gspreview/ which
outdates ftp://ftp.x.org/R5contrib/ .

XPsView (by Francois Bourdoncle, bourdoncle@prl.dec.com) is a Motif wrapper
around PsView, which is a X11 DSC Document viewer that can use both XDPS and
GhostScript as the interpreter engine. An early version was an the Alpha
Freeware CD. More recent versions, which include batch translation of
PostScript files into PPM files, are on http://www.ensmp.fr/~bourdonc .  This
software is "postcardware", that is, if you like it, you are kindly requested
to send the author a postcard.  Version 1.47 is current as of 10/96.

Also [commercial products not recently confirmed]:

ScriptWorks is Harlequin's software package for previewing and printing
PostScript(R) descriptions of text and graphics images; previewers for X are
available. For information call +44-223-872522 or send email to
scriptworks-request@harlqn.co.uk.

Image Network's Xps supports the full PostScript language and renders in
color, grayscale, or monochrome. Fonts displayed are anti-aliased. Info:
Image Network, +1 415 967 0542.

Digital's dxpsview runs on UWS 2.1 and 2.2.

Sun's pageview runs with the X11/NeWS server. 

Showpage, the PostScript previewer from Adobe Systems, is available from ICS
as part of the Display PostScript System for Sun Solaris 1 (SunOS).  More
information is available from ICS at info@ics.com, or +1 617 621 0060, or Fax
at +1 617 621 9555, http://www.ics.com .