What are some alternatives?
Dialogflow - Conversational UX Platform. (ex API.ai)
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Conversation.one - Enable machines to speak fluently with humans.
ManyChat - ManyChat lets you create a Facebook Messenger bot for marketing, sales and support.
Microsoft Bot Framework - Framework to build and connect intelligent bots.
IBM Watson Assistant - Watson Assistant is an AI assistant for business.