Since 1year I was using Rasa for building the chatbots. One of my client did not want to implement the bot using rasa due to heavy resource usage. Then I started looking for the frameworks in Nodejs and in other languages. Microsoft providing bot framework but it was not a brainy chatbot. Then I found a chatbot framework in Go lang, its Olivia chatbot framework. It does consume much resources compared to Rasa.
I do not know much about it.
If anyone know more about it please tell me.