Rasa Core - Rasa Core is a well-designed dialogue engine used to create chatbots.
Octane AI - Octane AI offers tools to create a bot and engage customers and audience via messaging.
AWS Lambda + Motion AI - Build bots using Node.js, in your browser!
marbot - A Slack bot detecting and managing incidents on AWS.
Recast.AI - Recast.AI is the leading platform to build, connect and monitor bots.
Microsoft Bot Framework - Framework to build and connect intelligent bots.