2GIS - 2GIS provides 3D-maps of 180+ cities, contacts of 1.
QGIS - QGIS is a desktop geographic information system, or GIS.
OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
RMaps - RMaps is the navigation tool. You can use RMaps like online map viewer for some popular maps.
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.