Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
SiteGPT - ChatGPT for every website.
ChatterOn for Messenger - Build Facebook chat-bots in under 5 minutes
ChatNode AI - ChatNode lets you train AI ChatBots on your own data.
VECA - Your eCommerce assistant
Dialogflow - Conversational UX Platform. (ex API.ai)