I've recently been playing Silk Road Online. It's a great MMORPG and it's free (you can buy some bonus stuff if you want to though). Its theme is based loosely around the time of the Silk Routes to China. I've only been able to play a Chinese character so far (lvl 14 now), but the graphics are pretty decent and gameplay is rather nice. Only problem is the fact that the server are often very busy... especially in the evenings in the EU timezone (when I was in Ohio, I could always log in around 8 p.m or so, btw).

Did I forget to mention Rappelz? From experience I can say that games made by gpotato are usually good.

You could try Cube. Its a free FPS game, I quite like it. You can find it here.

Bloodmasters is free and pretty good for a quick an simple fragfest and not too demanding on the system

What about Alien Arena 2007?
I've seen it on Abandonia Reloaded but I dunno if it's a good multiplayer game, what's your opinions?
Could it be good for lan party?

I just downloaded Silkroad Reup, and I'm looking forward to checking it out.

Also, Pirates Of The Burning Seas looks like it's going to be an amaging game. Although ultimately you will have to pay for it I am sure that it will be less expensive than anything Disney has its money hungry little fingers all over. Also, it's open for beta-testing now so if your application is accepted you will get a free look in :)

EDIT: Fixed my stupid typos...

Eternal Lands looks pretty sweet. I may have to check that out.

Aaagh! Damn you Reup! I've got myself a brand new internet addiction with this fenagled Silk Road :)

@Bill Fulks - DON'T! I tried it, and it sucks big time.

Don't want to come off as a spammer or some bot but these two sites have free mmorpgs to play. I wouldn't say so huge of a player base on either but they're sort of ultimaesque. Dransik takes some getting used to and I just find it hard to play without getting bored.

euo isn't bad but its more of just a pure grindfest.

Never played tibia but heard about it.

Again, most mmo's lack in content so take what you will of a time passer or combat type game with chat features.

euotopia.com/
www.dransik.com/
www.tibia.com/