OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
Printmaps.net - Make high-dpi maps for print applications within minutes, using the Printmaps editor. Put custom geo data such as routes or shapes onto your map, or geocode hundreds of addresses to populate your map with POIs.
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.
CityMaps2Go - CityMaps2Go is the ultimate offline map for travelers who want to be prepared wherever they go.
StepMap - With StepMap you can create maps for free.
CoPilot GPS - Get accurate GPS navigation with voice-guided, turn-by-turn directions everywhere you go.