QGIS - QGIS is a desktop geographic information system, or GIS.
Open Topo Data - Free elevation API.
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.
Open-Elevation - A free and open-source elevation API.
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.
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.