QGIS - QGIS is a desktop geographic information system, or GIS.
OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
GRASS GIS - GRASS GIS is a free Geographic Information System (GIS) software used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization.
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.
ArcGIS - ArcGIS software is a data analysis, cloud-based mapping platform that allows users to customize maps and see real-time data ranging from logistics support to overall mapping analysis.
CityMaps2Go - CityMaps2Go is the ultimate offline map for travelers who want to be prepared wherever they go.