OpenStreetMap is a huge user-made map site that anyone can use and edit (sort of like the Wikipedia of the map world). It’s sponsored by various universities and other organisations, and does not track its users.
There are many unofficial sites that let you search the maps from OpenStreetMap, while the official site is mainly intended for those who want to edit the map itself.
ANDROID APP – OsmAnd and others.
iPHONE APP – OsmAnd and others.