I've been keeping an eye on the ShipBuilder PAAS project - the minimalist Heroku clone written in Go. It is starting to look quite promising.
Quoting jaytaylor's comment [1] from below:
> You may be interested in checking out ShipBuilder - it
> is an open-source Heroku-clone PaaS.
>
> ShipBuilder is written in Go, and uses Git, LXC and
> HAProxy to deliver a complete solution for
> an application platform-as-a-service.
>
> http://shipbuilder.io [2]
>
> https://github.com/sendhub/shipbuilder [3]
Quoting jaytaylor's comment [1] from below:
[1] https://news.ycombinator.com/item?id=6292463[2] http://shipbuilder.io
[3] https://github.com/sendhub/shipbuilder