just-chat is a very simple chat app made with Node.js and socket.io. It is very simple, lightweight and deploy-ready.
git clone https://github.com/dynamo58/just-chatcd just-chatnpm installnpm start
Note that you must have a PostgreSQL server, address has to be added to the environment variables (the server must have SSL enabled, otherwise you'd need to go and modify a couple of files in the repo). If you've done that, the application is running from the terminal and is available at localhost:3000.