I took the tour on their site and it looks neat but the first thing I thought was, "Where's my layout tool?"

Open source hardware is no good if I can't manufacture it on a circuit board. Yes, breadboarding is handy for small stuff, but 256 pin BGAs don't fit on breadboards. And repeatability isn't so grand.

With a nice, reasonable to use layout tool (even with just simple routing assistant type features [push and shove]) and tutorials on how to use it, what DRCs are and how they're used, and maybe videos showing people who know how to do this stuff teaching, upverter could be really cool. Heck, for a full-ish featured EDA package in the cloud targeted at open hardware, I'd even pay to use it (provided we're not talking Cadence or Mentor money, more like GitHub paid account money).