I’ve been impressed with OSM’s https://opentrailmap.us/

but it doesn’t have the ratings/uploads/discussion that something like alltrails has. might be cool to have a fediverse/activitypub application using OSMtrails data.

KDE gonna start shipping with Krindr

https://browser.dataspace.copernicus.eu/ Sentinel 2 imagery is the closest thing to an open source spy satellite

https://earthexplorer.usgs.gov/ has a ton of aerial photography across the US. satellite pics too, but the planes are usually higher res and cover more area