Maps
https://apps.sentinel-hub.com/eo-browser/
http://eumetview.eumetsat.int/mapviewer/
https://www.planet.com/explorer/
https://scihub.copernicus.eu/
https://research.csc.fi/open-gis-data
https://openmaptiles.com/
https://gisgeography.com/free-global-dem-data-sources/
http://freegisdata.rtwilson.com/
http://www.strang.fi/karttatieto/
http://maps.vlasenko.net/soviet-military-topographic-map/map200k.html