Ask HN: OpenSource PaaS

Has anyone worked with any OpenSource PaaS systems? We'll be using AWS BeanStalk for our rollout of our service, but wanting to know if we can run our own PaaS-type service on our own choice of hosting.

Basically git hosting, auto-scaling and auto-balancing aswell as health monitoring.

I know there's a wealth of PaaS providers that provide this, but yeah, wanting to run our own on a chosen host.