Moby Project - a collaborative project for the container ecosystem to assemble container-based systems https://mobyproject.org/docker/docker-ce
Docker CE https://www.docker.com/community-editionplay-with-docker/play-with-docker
Play With Docker gives you the experience of having a free Alpine Linux Virtual Machine in the cloud where you can build and run Docker containers and even create clusters with Docker features like Swarm Mode.
Under the hood DIND or Docker-in-Docker is used to give the effect of multiple VMs/PCs.
A live version is available at: http://play-with-docker.com/gliderlabs/logspout
Log routing for Docker container logs