🗺️ StreetComplete, https://streetcomplete.app/.
A mobile app (Android only for the moment) that helps finding missing OpenStreetMap data around you, and displays them like quests 🧙! Given information are automatically added to OSM under your name.
It’s so cool!
FAQ: https://wiki.openstreetmap.org/wiki/StreetComplete/FAQ
iOS: NLNet is sponsoring iOS support, https://github.com/streetcomplete/StreetComplete/issues/5421#issuecomment-2849221573