Mutli-cloud management pioneers
There are many promising young startups in multi-cloud management. But before they came along, there was Scalr, founded in 2007 by Sebastian Stadil, organizer of the Silicon Valley Cloud Computing Group, and RightScale, founded in 2008 by CEO Michael Crandell, CTO Thorsten von Eicken and head of engineering Rafael Saavedra. These firms were in place before Amazon Web Services was ready to make infrastructure as a service available as a supported service. It was in preview up until 2009, if I remember correctly.