OSMfocus
Website RepositoryMichael Vittrup Larsen's OSMfocus was an incredibly useful tool to investigate and debug OpenStreetMap data. Unfortunately the app stopped working with the deprecation of the non-TLS version of the OpenStreetMap API.
Michael no longer had the time to maintain the app, so I decided to pick up the project and released an new version from scratch, dubbed OSMfocus Reborn. This new version uses Kotlin and Android Jetpack and has 100+ active users on Google Play (I don't have usage numbers from F-Droid because the app has no tracking).
You can download it on Google Play or via F-Droid.