Dungeons & Dragons Online: Eberron Unlimited or DDO is a MMORPG developed by Turbine released on February 28, 2006. The game attempts to recreate the D&D (Dungeons & Dragons) universe while following the D&D 3.5 Rule-set with certain twists naturally derived from adopting a real-time combat system (the tabletop D&D uses a turned-based combat system).

DDO is not using the full range of the D&D races and certain Eberron-specific classes are also unavailable. There is no race/class combination restriction and any of the following can be of the following can be used together:

Races: Humans, Elves, Dwarves, Halflings, Warforged, Drow, Half-Elf and Half-orc.
Classes: Barbarian, Fighter, Monk, Paladin, Ranger, Rogue, Bard, Cleric, Favored Soul, Sorcerer, Wizard.

The D&D alignments are not entirely imported into Dungeons & Dragons Online as the evil alignment is not available for players. Alignments restrict some character/class combinations as well as usage of certain equipment.

Starting with June 9, 2009 Turbine announced that Dungeons & Dragons Online: Stormreach, the original name of the game, switches from a subscription based business plan to a free-to-play one. The free-to-play approach makes almost all the game content available to everyone at no cost. However certain aspects remain locked and can be accessed by spending Turbine points. With the change of the business plan the game also received a new name and since 2009 it’s called Dungeons & Dragons Online: Eberron Unlimited.