Online Maps
Michelin’s ViaMichelin.com for general maps of Europe, quite accurate for France (less so for Switzerland, Italy, and other countries).
French IGN maps of France and territories.
Austrian maps BEV Austria (only supports certain versions of the Java plug-in, but lately works on the Mac as well as many PCs with the right plug-in installed).
Switzerland maps at Swissgeo are probably the best working online maps of a special country.
Liechtenstein maps are available at the government portal.
Italian IGM maps (VERY OLD) on a bad website (also does not work on Macs, while the “new version” works only with 1:250000 maps, and is a bit confusing)
Slovenian maps at NVAtlas where you have to register. I am not sure what it says, but I managed to register. (It works, but slightly strange.) Austrian maps are slightly better.
Northeast Spain (Catalonia) maps at Catalonia Online are good.
Other maps of Catalonia at Hipermapa are also good.
Maps of Navarra are also good and load faster than most.
Maps of the Cuneo region of Piemonte, Italy.
There are also maps of the Torino region of Piemonte, which are a bit tricky to use (at least on the Mac).
Bigger scale and easier to access Torino maps.