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Help improve OpenStreetMap with StreetComplete
(streetcomplete.app)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I use it once in a while when I'm taking a walk, it's made purposely to fill stuff easily on the go.
For more detailed/complex edits, I go with Every Door.