Fig (Fast, isolated development environments using Docker) -- http://www.fig.sh
Sandstorm (Personal Cloud Sandbox /!\ uses LXC, not docker, but it's so nice) -- https://sandstorm.io/
ns-enter (no more ssh, enter name spaces of container) by @jpetazzo
Squid-in-a-can (in case of proxy problem) by @jpetazzo
docker-gen (Generate files from docker container meta-data) by @jwilder

Shipyard (Composable Docker Management) -- http://shipyard-project.com/
Panamax (Docker Management for Humans) -- http://panamax.io/
Docker Registry
Docker Registry Web (A web UI for easy private/local Docker Registry integration) by @atc-
Flynn (A next generation open source platform as a service (PaaS)) -- https://flynn.io/
Deis (Your PaaS, your rules) -- http://deis.io/
CoreOS (Linux for Massive Server Deployments) -- https://coreos.com/
Boot2Docker (docker for OSX and Windows) -- http://boot2docker.io/

Slides

Videos