Research, build, trade, and fight mechs. Form clans and guilds. This game is an oldie but a goodie.
Circle of Darkness...
I can't believe how much time I wasted playing this game before I realized how much time I was wasting on this game. If you just want to mindlessly pound on the other players characters for a while here's your chance.
Archmage...
Archmage is one of those games that people love or hate. I tried it, but frankly found it too difficult see the screen. The contrast between the background and the text was poor. Also the font is too small. It seems like a really great game, and many people I know love it. Tell me what you think.
Dragon Court...
I have played Dragon Court forever. It is the first online game that I ever played. It is a simple little text game but I have really enjoyed through the last couple of years. I don't play the pay version, but I really enjoy this one.