OsmAnd is a community-driven navigation app that lets you store vector maps of any region for use offline. It offers turn-by-turn voice-guided navigation for driving, cycling, and walking, with features like contour lines, satellite views, and public transit routes. The maps (sourced from OpenStreetMap) are updated monthly. OsmAnd is open-source and privacy-focused: it can run entirely offline on the user’s device without sending personal data to any server.