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Zendesk Answer Bot - Chatbots
SmoochBot - Open source on-boarding bot for conversational apps
Aivo - Skyrocket your Customer Service and Sales KPIs with a Chatbot powered by Artificial Intelligence. Give time back to people.
Hotline - In-app chat,real-time engagement & self-service for your app
Tars - TARS enables users to create chatbots that replaces regular old webforms.