What are some alternatives?
When comparing Botfuel and Microsoft Bot Framework, you can also consider the following products
Conversational Form - Turning web forms into conversations. By SPACE10
Botpress - Open-source platform to create, manage and extend bots
Dialogflow - Conversational UX Platform. (ex API.ai)
Amazon Lex - Harness the power behind Amazon Alexa for your own conversational apps.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.