Maps and Navigation

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OpenStreet Map - OSM 

OSM are community developed maps project that really can replace Google maps.  openstreetmap.org
As free and open source OSM have big community and impressive APP ecosystem. Many projects develop interesting solutions based on them. Lot of those project are really well polished and provide great user experience.

Apps ecosystem is big, here are some:

Maps.me

OpenStreetMap is a project aimed squarely at creating and providing free geographic data such as street maps to anyone who wants them. It is a free editable map of the whole world. It allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth. 

maps.me


OsmAnd

Enjoy voice and optical navigator, viewing POIs (points of interest), creating and managing GPX tracks, using contour lines visualization and altitude info (through plugin), a choice between driving, cycling, pedestrian modes, OSM editing and much more.

osmand.net