Meya.ai - Build, train and host sophisticated bots.
Botkit - Botkit is an open source developer tool for building chat bots, apps and custom integrations for major messaging platforms.
Chatbots - Chatbots.org (BETA)
Dialogflow - Conversational UX Platform. (ex API.ai)
Chatbot Templates - 50+ bot templates you can use in one click
Landbot - An intuitive no-code conversational apps builder that combines the benefits of conversational interface with rich UI elements.