marbot - A Slack bot detecting and managing incidents on AWS.
hackattic - No nonsense, real world programming challenges
Rasa Core - Rasa Core is a well-designed dialogue engine used to create chatbots.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
AWS Amplify Admin UI - Firebase from AWS, but much better
Takehome - Effective and humane coding challenges for candidates