This demo application shows it's possible to run the Crossbar router through Heroku.
See http://crossbar.io/docs/Setup-on-Heroku/ for more details. Be careful, Free apps can only be active up to 18 hours of a 24 hour period.
Find out more: https://devcenter.heroku.com/articles/dyno-sleeping
It's recommended to stop and verify in your dashboard if the worker is running if you don't want to get charged.
heroku ps:scale web=0
heroku logs --tail