Microsoft Bot Framework - Framework to build and connect intelligent bots.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Gomix - The easiest way to build the app or bot of your dreams
Hubot - Hubot is a standardized way to share scripts between everyone's robots.
Motion.ai - Motion is AI based bot builder enabling users to visually build, train and deploy bots to do just about anything.