Dialogflow - Conversational UX Platform. (ex API.ai)
Gomix - The easiest way to build the app or bot of your dreams
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
SMS Chatbot - Build your own SMS based text-bot in Botsify.
Botpress - Open-source platform for developers to build high-quality digital assistants
Chat Widget from ChatBot - Place your bot on your website and let it chat with clients