Parrot
Floating Combat Text of awesomeness. Caw. It'll eat your crackers.
Mists of Pandaria 
The Burning Crusade 
Wrath of the Lich King Addon Details
Expansion
Developers
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Displays Events from the combatlog (damage, healing, …) as moving text and numbers across the Screen. It also supports various other Events (Loot, Cooldowns, …). Further Parrot offers a Trigger-system to display Text and play sounds on certain predefined events (e.g. Nightfall for Warlocks).
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Cataclysm
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Examiner
Advanced Inspection Mod of Gear, Talents, Honor, Arena and Achievements.
Scrooge
Keeps track of gold and cash flow across multiple characters
IdiotCheck
Checks your gear before bosses and yells at you if you're an idiot
WarlockReminder
Provides helpful buff reminders for Warlocks.
Spinx Daily Items
Daily quest and PvP items direct to your actionbar
BlizzMove
Move those default blizzard windows.
ConfirmLeaveParty
Asks for confirmation to leave a group inside an instance.
ReforgeLite
Reforging calculator that helps you figure out the optimal strategy to reforge your gear