Microsoft Bot Framework - Framework to build and connect intelligent bots.
IBM Watson Assistant - Watson Assistant is an AI assistant for business.
ChatBot - Easy to use chatbot platform for business
Zendesk Answer Bot - Chatbots
Amazon Lex - Harness the power behind Amazon Alexa for your own conversational apps.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.