World Of Goo just turned 1 year old and they're selling it for any price you want for this week only. So you can get it for 0.01$ if you want, that's almost like free.
Mu Online is said to be very good...
I didn't play it because my TFT gave me an error when opening it :/
also: ToribashRuler your link doesn't work... -.-
ShiftV3: I played it but the lag is ridiculous...
I hope that will improve over time...
err....
i played it yesterday :/
i also checked the net and they say it is BECAUSE of the new updates...
my connection is good and i had no lag in the training mission so it can't be my comp either...
but the game is still awesome
sauerbraten is also pretty fun
Slapshot or Albatross 18/pangya
Tribes 2 - free too, just find it at tribesnext site
Gunz- ijji
Grandchase - international version
RF online - if you're a mech geek
O2jam- if you're into it