Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Landbot - An intuitive no-code conversational apps builder that combines the benefits of conversational interface with rich UI elements.
Carrd - Simple, responsive one-page site creator.
Botlytics - Analytics for your bot
Message.io - Make your chat bots cross-platform
Dialogflow - Conversational UX Platform. (ex API.ai)