The ghostscript interpreter may be obtained via anonymous ftp from ftp://ftp.cd.wisc.edu/pub/ghost
gv is based on Tim Theisen's ghostview 1.5. ghostview 1.5 may be obtained via anonymous ftp from ftp://ftp.cd.wisc.edu/pub/ghost
The sources of Kaleb S. Keithley's modification of the Xaw widget set may be obtained via anonymous ftp from ftp://ftp.x.org/contrib/widgets/Xaw3d.