PlaneShift

This is a free cross-platform fantasy MMORPG. PlaneShift is set inside a gigantic stalactite named Yliakum, which is divided into eight levels, of which the lowest two are flooded. Life in the stalactite is made possible by the presence of a giant crystal named The Azure Sun, which draws light from the surface of the planet. PlaneShift has 11 playable races, all of which have their own unique homelands and gameplay characteristics. Outside of Yliakum are the Stone Labyrinths, and through these the player character can access even more areas, such as the cave in which the stalactite hangs. In Crystal Blue, only the city Hydlaa and a part of the city Ojaveda are accessible.

PlaneShift Website