PiCloud is a layer of abstraction above the IaaS providers you've listed. That is to say that it gives you software infrastructure to design workflows and distr

PiCloud is a layer of abstraction above the IaaS providers you've listed. That is to say that it gives you software infrastructure to design workflows and distribute them across the machines provided by an IaaS provider. In some ways it's like Heroku, and in others it's another layer beyond Heroku (App Engine-like?). You architect your work around the PiCloud tools. I think PiCloud currently runs on AWS.