Interesting post. Not sure how useful a direct link would be. (especially with such an expensive piece of software!!!)
FYI, I'm not an EE, but I did take a couple grad courses last year and got some exposure to SPICE. There seem to be around a billion different implementations...
As a project I used
LTSpice to simulate a 'Big Muff Pi' stomp-box (guitar pedal) and compared it to the real thing. The reasons I went with LTSpice (1) it's available for free; (2) easy to use without knowing much SPICE or reading the manual; (3) it allows you to input a raw WAV file---in my case, an actual guitar track---rather than limiting users to traditional test signals. Wouldn't surprise me if other SPICE simulators are set up to do (3)... does anyone know? (
SIMetrix is another simulator considered.)
I've also toyed with purchasing the one of the following Mathematica packages:
Analog Insydes (definitely too expensive for me),
MathModelica, or
SchematicSolve. Difficult to make a choice without trying them out first, and I have no idea how useful they'd actually be for me.

Anyone have experience with these packages?
-RG