Quadruino, an Arduino QuadCore !!!

I used DipTrace to lay it out which is restrictive in pin-count instead of sq-in.

I have that program, too. I think it just moved up in my "need to learn" queue.

They have a program where you can get a better Not for profit license by emailing them.

Registration data should be copied into Help/Register dialog box in Freeware
or into nag-screen in trial version.

Notice that Non-Profit (Lite) license works only starting from 2.0.06, so if
you have earlier version please download update from
Download DipTrace - DipTrace

This offer works for all active DipTrace users, not only for single
community/forum members, so if you wish you can post info about this offer
to other PCB/EDA communities where people may be interested in it (please do
not spam though).

With kind regards,
Victor Savenko
DipTrace Team