Dialogflow - Conversational UX Platform. (ex API.ai)
Epichat for Messenger - Raise your social media marketing to the next level
Botpress - Open-source platform for developers to build high-quality digital assistants
Upcado - Super easy to use Messenger Marketing tool for your business
Meya.ai - Build, train and host sophisticated bots.
Conte.ai - Conte.ai is a modern web-service for businesses of all sizes from any industry