Showing an obvious bias my first thought was "Why is Sunstone Circuits on HN?".<p>They make printed circuit bards (PCBs) and have their own layout free software PCB123, which I've not used. If you are into PCB layout their blog is worth following for layout tips. I have bought boards from them and had no issues.<p><a href="https://www.sunstone.com" rel="nofollow">https://www.sunstone.com</a>