Daimonin

"Daimonin is a online role playing game (MMORPG). Inside the game you play a fearless hero and you will meet many other people in our big, persistent fantasy universe. While playing make friends and enemies, become a hero with sword and magic or just be the best weapon smith around."

Free to play indefinitely.

Dark Eden

Play a vampire or a slayer. Choose your race, gender, and appearance. This is a horror RPG - something like Runescape but much more violent.

Free to play indefinitely.

Deloria

A whimsical fantasy role playing game.

Free to play indefinitely.

Discordi

"You gain IQ points by landing on bonus steps, but watch out though, there are some very lethal steps as well! Take caution though: You must also be careful of sudden solar winds, meteor showers, and ion storms that can slow you down or wipe you out!" Plot against your friends and do whatever it takes to come out on top.

Free to play indefinitely.

Dofus

Quirky anime style fantasy RPG. Features 11 different character classes, guilds, many skills and professions.

Free, with option to pay for additional features.

DragonWars eXtreme

DragonWars is set in a time of high fantasy. Based on the 'Ryn' world, there are numerous realms to explore, from great wildernesses, to the darkest dungeons.

Free to play indefinitely.

Dungeon Stomp

"Dungeon Stomp is a 3D multiplayer/single player dungeon game based on the d20 game system. Dungeon Stomp will allow you to see your dice rolls, as you would, in a d20 based game system. You can also see your rolls when you listen at doors."

Free to play indefinitely.