AWS Lambda - Automatic, event-driven compute service
Chatfuel - Chatfuel is the best bot platform for creating an AI chatbot on Facebook.
Spot.io - Build web, mobile and IoT applications using AWS Lambda and API Gateway, Azure Functions, Google Cloud Functions, and more.
Gomix - The easiest way to build the app or bot of your dreams
Google Cloud Run - Bringing serverless to containers
Motion.ai - Motion is AI based bot builder enabling users to visually build, train and deploy bots to do just about anything.