Alternate for ngrok

Just followed the steps mentioned in the GitHub - RasaHQ/tutorial-rasa-google-assistant: This repository contains the code of the tutorial 'Going beyond ‘Hey Google’: building a Rasa-powered Google Assistant' for integrating rasa with google assistant.

And I was able to successfully integrate with google assistant. But please can you suggest an alternate for ngrok as we have to deploy the chatbot on production and using ngrok is not advisable.

Thanks, ajshrr