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.
You can always add more (harder) tasks that are disabled by default. That’s what I do for regions where there aren’t enough tasks (that I’m interested in)
There’s always the the “advanced” version of StreetComplete: SCEE.