Like the original Pixel Party (http://pixelparty.me/) but with websockets instead of AJAX.
HTML and Javascript borrowed from http://pixelparty.me/. Websocket code borrowed from https://github.com/extend/cowboy.
To compile this you need rebar (https://github.com/rebar/rebar) in your PATH.
Type the following command:
$ rebar get-deps compile
You can then start the Erlang node with the following command:
./start.sh
Then point your browser to the indicated URL to open a websocket client. Not all browsers support websockets. It was tested with Chromium.