The tool is called hsview. It was developed by a student at the
University of Adelaide (Alireza Moini) <firstname.lastname@example.org>
Alireza has made the tool available (Solaris 2.x/SunOs 4.1 executable only)
for download at the above referenced URL.
It will accept hspice binary, hspice ascii, and spice3 binary formatted data.
Apparently he developed it after being frustrated with the pricey
commercial alternative, and is making it available to all.
The tool works in a manner similar to awaves, has on-line help and is
pretty user friendly.