PyText - Facebook's open source conversational AI tech
Dialogflow - Conversational UX Platform. (ex API.ai)
Facebook DeepText - Facebook's text understanding engine
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
Hugging Face - The Tamagotchi powered by Artificial Intelligence 🤗
Botpress - Open-source platform for developers to build high-quality digital assistants