Argh. My browser crashed and ate up my posting :(
Update again. This week I'm into MMORPGs.
3 unfree ones:
Furcadia, Mana World and Lord of the Rings Online (Lotro).
Lotro ate up 33 GB of my HD space. (Edit: It has more than 30 seconds lag on my old PC. So no Lotro for me...)
And one free:
Stendhal. Simple gfx/GUI :(
And it needs a lot of grinding.
Pro tip: Don't play via browser, instead use the Java client. It's a good game.