MyNoise - Custom shaped online noise machines. Many Many generic sounds
Discover on Demand - Just like Spotify's Discover Weekly, but whenever you want.
ASMR Hunt - Find what relaxes you the most
Rocketgraph - Rocketgraph is an open-source drop in replacement to Firebase, except it's much better.
Mishi - Mishi improves your sleep, health and wellbeing through music and sound exploration.
Spotify - Map shows when two people play same song at same time