Meya.ai - Build, train and host sophisticated bots.
Dialogflow - Conversational UX Platform. (ex API.ai)
Botpress - Open-source platform for developers to build high-quality digital assistants
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.