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.
Botpress - Open-source platform for developers to build high-quality digital assistants
Dialogflow - Conversational UX Platform. (ex API.ai)
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
Landbot - An intuitive no-code conversational apps builder that combines the benefits of conversational interface with rich UI elements.