Microsoft Bot Framework - Framework to build and connect intelligent bots.
Gomix - The easiest way to build the app or bot of your dreams
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
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Hubot - Hubot is a standardized way to share scripts between everyone's robots.
Meya.ai - Build, train and host sophisticated bots.