It is called Flyff, which stands for Fly For Fun. It is the only Online MMORPG in which you can fly. It's a good game for those looking for a free MMORPG (Although there are options to pay, it doesn't affect gameplay.)
Flyff is a great game, you start off in the Vagrant class and make your way up to level 15 which is the level where you can switch jobs to either a Magician, Acrobat, Assist, or Mercenary. At level 20 you can buy a board or broom and fly. (Hence the name, Fly For Fun) It is 3D and has great graphics + gameplay for a free game. At level 50 you can create a guild, and at level 60 you can have your second job switch. Magicians can become Physkeepers or Elementalers. Assists become Billposters or Ringmasters. Mercenaries become Blades or Knights. Acrobats become Rangers or Jesters. Check out the site for more info on the differn't jobs.
I am currently a level 23 Magician in the "Rich" standings of most players. My character name is Manipulate if you would like to add me.
Website link: Flyff