3. Is gwave the standard tool to plot ngspice/gnucap outputs? I would rathe= r not use the built-in ngspice (nutmeg?) plot utility, which does not seem very user-friendly.
You can use gwave to plot the output from ngspice & gnucap.
Installing it is a real pain, however.
\begin{shamelessplug}
unless you're using NetBSD or NetBSD's pkgsrc in which case you do
"cd /usr/pkgsrc/cad/gwave && make install"
\end{shamelessplug}
FWIW, pkgsrc is how I install all 3rd party software on NetBSD and also on solaris.
-Dan