- [Building a Real-time, Polyglot Application with Node.js, Ruby, MongoDB and Socket.IO](https://devcenter.heroku.com/articles/realtime-polyglot-app-node-ruby-mongodb-socketio)
- [Building a Real-time, Polyglot Application with Node.js, Ruby, MongoDB and Socket.IO](https://devcenter.heroku.com/articles/realtime-polyglot-app-node-ruby-mongodb-socketio)
- [Using Socket.IO with Node.js on Heroku](https://devcenter.heroku.com/articles/using-socket-io-with-node-js-on-heroku)
- [Using WebSockets on Heroku with Node.js](https://devcenter.heroku.com/articles/node-websockets)