Rasa Core - Rasa Core is a well-designed dialogue engine used to create chatbots.
marbot - A Slack bot detecting and managing incidents on AWS.
Microsoft Bot Framework - Framework to build and connect intelligent bots.
Servers.lol - Should your EC2 be a Lambda?
AWS Amplify Admin UI - Firebase from AWS, but much better
Gomix - The easiest way to build the app or bot of your dreams