Wanting to mention CoMaps and that it was forked from Organic Maps.

The projects aren't very diverged yet so you can still migrate your pins with an easy export/import

Organic Maps is so fucking good, I keep so much of it downloaded as a backup for when I'm offline, because it just works. That said, I still use Google maps due to the reviews of businesses and traffic data when navigating normally, but it's good to know a great alternative is out there.