https://www.facebook.com/BucevschiBot
This is a Facebook Messenger bot used for programming contests reminders. It is written in NodeJS. In order to set it up locally you have to create a new bot on Facebook and then run npm run dev.
Until Oct 31, 2022 it was hosted on Heroku. Now it is hosted on a free-tier AWS EBS using a free Postgres database from elephantsql.