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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One-key solution for mounting/dismounting, supports spells, shapeshifting.
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An extension to the default WoW Unit Frames.
TradeskillInfo
TradeSkillInfo gives you all the information that you need about tradeskills.
GearCheck
Request others average Item-Level and answers to those requests