FIRMS
Generate a panorama
GeoLocateThis
Google Earth (download link)
Google Maps
GPSies
Gpx File Editor
DigitalGlobe
Dual Maps
Tools.wmflabs.org
Planet Labs $$$
Wikimapia
Yandex.Maps — detailed map of the world
Zillow
GeoGratis (CAN)
GeoLocateThis
Geonames
Google Maps
GPSies
Hectometerpaal (NL)
Hoogspanningsnet (NL) (power pylons)
Instant Google Street View
Islamic State map
Kadaster - Bagviewer (NL)
Livingatlas - Wayback
Mapchecking
Mappillary
NewspaperMap
Strava Heatmap
Whats3words