TERA 'Free' Trial
 

http://tera.enmasse.com/demo

They've got a free demo going now that's browser based. You don't have to download anything and as long as you have Java enabled you can try it out.

There are three pre-made characters you can try out: Lancer, Sorcerer, and Warrior

Your character is already level 20 and you get to play through to Prologue.