OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.
MAPS.ME - Fast, detailed and completely offline maps for mobile devices
HERE WeGo - HERE WeGo - Maps - Routes - Directions - All ways from A to B in one
OpenStreetMap - OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Gaia GPS - Trail maps for all your adventures