World of Warcraft has a highly customizable User Interface (UI) and one of these player-developed “UI-Mods” is Cosmos. Cosmos is easily installed and adds many useful features to World of Warcraft. To get more useful mods and addons including exclusive exploits, signup at MultiplayerStrategies.

A few of these features are:
Quick Loot: Moves the looting dialog to the position of your mouse pointer.

Quest Share: Share your active quests with other Cosmos users.

Second, right and left bars: Extra hotkey bars to the interface.
The head of Cosmos development is AlexYoshi. You can find the Cosmos downloader here.