VISEO Bot Maker - Create chatbots and vocal apps in just a few clicks
Dialogflow - Conversational UX Platform. (ex API.ai)
boteria - Business chatbot has never been so simple and fast
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
Botpress - Open-source platform for developers to build high-quality digital assistants
Microsoft Bot Framework - Framework to build and connect intelligent bots.