StreetComplete: An app for those who want to contribute to OpenStreetMap
StreetComplete | F-Droid - Free and Open Source Android App Repository
https://www.f-droid.org/en/packages/de.westnordost.streetcomplete/
OpenStreetMap surveyor app
Help to improve the OpenStreetMap with StreetComplete!
This app finds incomplete and extendable data in your vicinity and displays it on a map as markers. Each of those is solvable by answering a simple question to complete the info on site.
The info you enter is then directly added to the OpenStreetMap in your name, without the need to use another editor.