Maps
Maps from Google, including Street View, 3D, Photo Spheres
Browser-based version of Google Earth. The standalone desktop version is also very useful - it can be downloaded here
Map service from Microsoft. Small variations in satellite orbit can mean dramatically different views to Google Maps
Map service - particularly useful for Russia and surrounding countries
Crowd-sourced maps with descriptive details of locations and very useful filter layers
Crowdsourced street-level imagery
Global crowd-sourced maps
France only. Satellite views, sometimes with alternative angles to Google Earth
Mountain and hill peaks worldwide, with visual representations
Allows you to switch between a number of different satellite views, including Apple Maps, Google Maps and others
Shows aerial videos of locations marked on a world map
Crowd-sourced maps showing railways worldwide