which port for this job?

[Chuck Robey]

I need to block out a mildly complex OO diagram, and I wanted to get a
suggestion for what ports selection might be best.

So far, everything I've tried has either been so extremely full of jargon that
one can't use it without a semester course in it (or 6 months rereading the UML
spec).  The last one I found, dia, was far simpler (enough so that I could use
it) but it produced gigantic pdf exports, which needed like a mosaid of 5x5
printed sheets to view it, and no easy way tio shrink it.

So, what might be both simpler, and have easier exporting?

Thanks