Google Earth Pro - Google Earth Pro allows you fly anywhere around the earth to view satellite imagery, maps, 3D building, and terrain, from galaxies in outer space to the canyons of the ocean.
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Google Earth VR - Walk the earth in VR
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
QGIS - QGIS is a desktop geographic information system, or GIS.
LockOnMe - LockOnMe is a location-sharing app, displaying targets and associated Points Of Interest on maps & fun radars.