I work for Giant Swarm, a German startup. We are preparing to release our less opinionated container stack for public availability. Features include bare metal provisioning, flexible service discovery, user/org management tools, PaaS'ish interface for devs, and a nice CLI. We're now deploying this solution on-prem for large customers who were looking to run container technologies at scale, including Docker. If you are in operations and are interested, drop me a line @giantswarm.io. My username is the same same as here! If you are a developer, we have an alpha test going on and I'm happy to invite you to it.