Zendesk Answer Bot - Chatbots
Pullstring - Powering computer conversation across all platforms.
Aivo - Skyrocket your Customer Service and Sales KPIs with a Chatbot powered by Artificial Intelligence. Give time back to people.
ChatterOn for Messenger - Build Facebook chat-bots in under 5 minutes
Tars - TARS enables users to create chatbots that replaces regular old webforms.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.