gv is an X11 PostScript and PDF previewer based on Tim Theisen's
ghostview-1.5.  It uses the Xaw3d widget set, thus providing a much
nicer look and it's said to be a bit faster.

Ghostscript version >=7.00 includes an X11 display with anti-aliasing.
Set:
  -sDISPLAY=x11 -dNOPLATFONTS -dTextAlphaBits=4 -dGraphicsAlphaBits=4.
to use it; this option has better rendering than x11alpha, but is
slower.