I recall ANSYS has a tool that can generate an equivalent N-port from the PCB fab. But good luck with that...
Not aware of any free, open tools to do same.
Next best thing is perhaps simply learning how the fields work, and setting up environments to 1. prove out the theory by experiment, and 2. apply theory in practice. Namely, we do #2 most often by using ground planes, so that traces manifest as transmission lines, with reasonable isolation between them (typically <10% coupling even for minimum-spaced buses), and low ground-return impedance, so that we can mostly ignore common mode effects. With these factors being relatively small, it isn't important what the exact coupling is, because it's small enough everywhere to assume equal to zero. Put another way: the coupling matrix is sparse.
I'm not sure what angle you're coming at this from -- it could be a relative beginner question, looking to just see the pretty pictures and play with a reasonably-realistic simulator (at least, if it's easy enough to work with), and in that way, perform those experiments and build up the knowledge level. Or it could be a professional in-depth level, where you already know generally how things work, but due to strict constraints on a given project, you need to evaluate tighter-coupled designs, and thus cannot make use of the design rules / assumptions listed above. (Or anything inbetween, like, say: getting a quantitative measure of ground bounce, coupling, etc., rather than just a hand-waving approximation to it.)
Tim
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