Check out StreetComplete. It's basically a map with question icons that help improve osm. It's even a bit gamified, you get achievements for a volume of replies

Check out StreetComplete. It's basically a map with question icons that help improve osm. It's even a bit gamified, you get achievements for a volume of replies :) Importantly, you can configure which types of question do you get, so you won't get bored by replying the same stuff again. More specialized, but perhaps more important for certain people is wheelmap.org. It catalogues amenities and their wheelchair accessibility. It has similar model for contribution as StreetComplete, you answer question about stairs, door widths and toilet accessibility. Have fun mapping :) Edit: corrected autocorrect.