StreetComplete makes contributing to OpenStreetMap easy and fun by turning contributions into “quests” on a map for you to complete. No personal information is required, just create an OpenStreetMap account, and start contributing directly in your area!
I tried this out myself, and it is truly fantastic! I had never heard of it, and I’m sure many of you haven’t either, so spread the word!
Tip: When entering buildings to ask questions (opening hours, etc.) be ready to explain what OpenStreetMap is :)
For iOS, Go Map!! (source) has a similar quests system. I don’t know how well they hold up to StreetComplete though, I’ve never used the latter.
Also, obligatory https://wiki.openstreetmap.org/wiki/How_to_contribute!