Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Landbot - An intuitive no-code conversational apps builder that combines the benefits of conversational interface with rich UI elements.
Botsify - Ever wonder if you could replace your live chat support system with a chatbot?. Its possible now with Botsify Chatbot For Website.
ChatBot - Easy to use chatbot platform for business
ManyChat - ManyChat lets you create a Facebook Messenger bot for marketing, sales and support.
Collect.chat - Interactive chatbot for collecting data & feedback