Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Botsify - Ever wonder if you could replace your live chat support system with a chatbot?. Its possible now with Botsify Chatbot For Website.
Expensive Chat - Chatroom where you pay per letter
ManyChat - ManyChat lets you create a Facebook Messenger bot for marketing, sales and support.
Messenger Platform - Discovery, chat extensions, and richer experiences