Looks interesting, and I'll probably give it a try-out. But it seems to store all design data in the "cloud" without the option to export it out, which means I'd be unlikely to use it.

Yes - The default is to stroe your data in the cloud.

But you can always download all of your designs in an open well documented json format.

Does anything else have the capability to work with the json format? Or what can I convert it into?

See here: https://github.com/upverter/schematic-file-converter

Thanks man, very cool!