StreetComplete - Help to improve the OpenStreetMap with StreetComplete!
Vespucci - Vespucci is the first OpenStreetMap editor for Android.
iD - iD is an OpenStreetMap editor programmed in JavaScript with the aims to be simple and friendly.
MapComplete - MapComplete is an OpenStreetMap viewer and editor. It shows map features on a certain topic, and allows to see, edit and add new features to the map. It can be seen as a webversion crossover of StreetComplete and MapContrib.
Osm Go! - Map your environment simply and fast, directly from the app. Keep your eyes wide open and contribute to OSM while on the run.
Osmapy - Osmapy - Python Editor for OpenStreetMap