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.
I use both versions actively, the main differences of SCEE compared to StreetComplete are the addtion of more obscure questions (for example building and roof colors, species/genus of trees), allowing direct editing of tags and disabling the gamification/statistics.