Uhh let's see...
Runescape ("Your last login was 443 days ago", no other comments)
Lineage 2 (many private servers, mostly bungarian, I still think my first server was the greatest and it was on the first page in hopzone)
World of Warcraft (private servers, haven't played much)
AQ browser games
Cabal Online (EU version)
Perfect World (an unknown english version, then the international one, then the EU one)
S4 League (EU)
Corum Online (only briefly, from a friend's PC and my own account)
Fly For Fun (maybe for 1 hour)
Dream of Mirror Online (GT version, I still keep the game client and haven't changed my DOMO wallpaper, best mmorpg so far)
Luna Online (no more than a month)
Bright Shadow (I'm still the biggest contributor to their wiki, too slow on my PC for it's graphics)
GhostX (while it was still beta)
Shin Megami Tensei: IMAGINE (also slow on pc, stopped playing because of that)
MU online (from an internet cafe)
Silkroad online (very briefly, didn't like it)
Florensia (slightly more than silkroad)
Magic World Online
TLBB (beta version)
Allods (EU version, kinda slow on pc)
Mabinogi (EU version, still playing it casually, originally wanted to play this before DOMO, but there wasn't an EU version yet)
Dungeons & Dragons Online (crashed right after I made my char followed by uninstall)
Requiem (played for a short time, resumed after a long time and stopped playing after a short time)
Free Realms (magician was for real money payment, didn't like it)
Fusion Fall (had to pay to proceed with the story, didn't like)
Dungeon Fighter Online (if it had Guilty Gear graphics it would rule
)
Zu Online (1-2 days, freaky model arms look like are made of paper while on a flying mount)
Metin 2 (no customization, less than 1 day)
Jade Dynasty (1-2 months, slow on my pc, ran perfectly on the school pc)
Aika (gpotato, lagging, slow on pc, I actually got the low memory warning on this one)
I started preferring games with servers in EU because of lag, so no aeria DOMO