Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Alex WikiMessenger Bot - A Wikipedia bot for messenger
Landbot - An intuitive no-code conversational apps builder that combines the benefits of conversational interface with rich UI elements.
botwick - Build your own SMS-based text bot
ChatBot - Easy to use chatbot platform for business
Sensay for Slack - Get advice from a helpful human, now available in Slack.