What's the present best practice as far as defining an application as a set of multiple inter-linking containers? I know of at least Shipyard and Panamax, and don't especially care for either of them.

Are there others? Is anyone clearly winning in this space?

As it stands, it seems far easier to just create a monolithic container with a bunch of running processes and a supervisord than to break up the pieces and then have a more complicated deployment.