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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.
StreetComplete and its expert editions are definitely my favourite way to contribute to OpenStreetMaps on mobile. There's also Vespucci which allows you to do more complex stuff like add paths and shape, but the UI isn't super great imo. Organic Maps which I use for navigation actually allows you to edit and contribute quite a bit.