Since not all good comics are made only in USA and Japan, I thought it would be good to mention some great european titles.
France:
- Blueberry (by Charlier and Giraud)
- Asterix (by Goscinny and Uderzo)
- Nikopol Trilogy (by Enki Bilal)
- Spirou (various authors, mostly Franquin)
- Gaston (by Franquin)
- Barbe-Rouge (by Charlier and Hubinon)
- Thorgal (by Van Hamme and Rosinski)
- Rapaces, Scorpion, L'Etoile du desert, Gipsy (all by Enrico Marini)
- Incal (by Jodorowsky and Giraud)
Belgium:
- Bernard Prince, Bois-Maury, Comanche, Jeremiah (all by Hermann)
- Tintin (by Herge)
- XIII (by Van Hamme)
- Lucky Luke (by Goscinny and Morris)
- The Smurfs (by Peyo)
- Largo Winch (by Van Hamme and Francq)
- Luc Orient (by Paape and Greg)
Italy:
- Alan Ford (by Magnus and Bunker)
- Corto Maltese (by Hugo Pratt)
- Druuna (by Paolo Serpieri)
- Lazarus Ledd (by Ade Capone)
- Ken Parker (by Berardi and Milazzo)
- various titles published by Sergio Bonelli Editore (Zagor, Nathan Never, Tex Willer, Dylan Dog, Martin Mystere, Napoleone, Magico Vento, Mister No…)
- Rat-Man (by Leo Ortolani)
Spain:
- Torpedo (by Abuli, Toth and Bernet)
- Los Profesionales (by Carlos Gimenez)
Norway:
-Sshhhh! (by Jason)
Great Britain:
- Modesty Blaise (by O'Donell)
- Judge Dredd (by Wagner and Ezquerra)
- V for Vendetta, Captain Britain, League of Extraordinary Gentlemen (all by Alan Moore)
- Dan Dare (by Frank Hampson)
- Slaine (by Pat Mills)
- Tank Girl (by Hewlett and Martin)
There's more, but these are some I remember at the moment. I'm sorry if I didn't introduce them. I'll try to give some info on them as the discussion progresses.