What is the best 3d online rpg that you dont need to download?

WHat is the best 3d online rpg that you dont need to download? Explain why too because i get mad bored and have no life so i want to play wow but i dont have it yet. sooo i need something to do until then. pretty pathetic, i know. but just answer anyway. (And yes, i do have a fucking life. Im not a fucking computer nerd)