It was originally developed for the Designing Interactive Artifacts course at the IT University of Copenhagen, and is now in use at Malmö University. We've also made some starter JS sketches which run on top of Kattegat.
Please note that the server is not designed with any kind of access control. Use a firewall to restrict connections, and only run the server when you need it. It should NOT be used for any kind of production purposes.
Read the Getting Started guide for how to install and update.