Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Amazon Lex - Harness the power behind Amazon Alexa for your own conversational apps.
Drift - A messaging app that helps you grow your business.
Faqbot - Build your chatbot for FAQ, sales and lead generation automation.
Stonly Knowledge Base - Interactive knowledge bases and help-centers
Dialogflow - Conversational UX Platform. (ex API.ai)