A visualizer and analytics app for air traffic data: https://adsb.exposed/ https://adsb.exposed/ Although it is based on another app, also made over a weekend:

A visualizer and analytics app for air traffic data: https://adsb.exposed/ https://adsb.exposed/ Although it is based on another app, also made over a weekend: https://reversedns.space/ https://reversedns.space/ But then it took a few months before I managed to write README for it.