Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
BotList - An app store for bots
Tars - TARS enables users to create chatbots that replaces regular old webforms.
ManyChat - ManyChat lets you create a Facebook Messenger bot for marketing, sales and support.
IBM Watson Assistant - Watson Assistant is an AI assistant for business.
ChatBottle - Chatbots Search Engine