I would like to include Void as a serious, competent and elegant distribution. I've used it for a complete year, and have really come to appreciate its focus on simplicity, reminds how Arch was before they decided to use systemd.
I'm glad you brought up this distribution. I think when we see more and more go the Docker route, we'll see more minimalist hosted systems that are Void or Alphine for hosting containers and container schedulers.