Apk Link: https://cdn.organicmaps.app/apk/OrganicMaps-24081605-GooglePlay.apk
Note: If you don't want to deal with stuff like this, I recommend you download and use it from F-Droid client or Accrescent AppStore.
Update: The app returned to the App Store.
It's called OpenStreetMap and there are many apps for it! Organic Maps is a good one and I like it for when I go abroad and want to preload an entire country instead of downloading maps on my paltry 33 or whatever gigs of roaming allowance (that also only works in the EU - if I want to visit the US, I get to pay out the ass for 250 MB or 1 GB at a time)