CoMaps

free and open source map & navigation app; community fork of Organic Maps

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CoMaps is a community-driven, free and open-source, offline navigation app that uses map data from OpenStreetMap (OSM). The app is designed to function without internet connectivity by downloading maps for offline use. CoMaps emphasizes privacy, transparency, and community collaboration, aiming to provide a navigation solution that is not only easy to use, but also respects user data and fosters open participation.

from Wikipedia