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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've used it quite a bit recently. It makes it really easy to submit data in small amounts. I usually have it open while walking my dog and enter in basic things as I go. I've completed about 1500 quests so far with it.