WowAce

Enables you to see Chinese, Japanese and other languages in game

Manages the scanning of the auction house in a reliable an efficient manner.

EquivalencePoints

Displays a grid of guild ranks versus permissions.

ElectrofluxTextronator

Tracks interrupts

Automatically sells low quality gray items and selected white items to the vendor.

Dedicated to Lazybones of EU Khadgar who had the original idea as he can't find a damn thing in his bags. You're a great guy...

Vox

GratuityLib

Monitor the remaining duration on your Mysterious Eggs and other perishable items.

Reverse Engineering will drill down and search your tradeskills for their elements

Langoustine

Automagically call who should cross over

oUF layout looking like ag_Unitframes and Grid.

Remaining and rested XP Data Broker plugin.

Fancy up the PlayerPowerBarAlt frame

Welfare Epics

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

Automatic tracking of the current target's creature type. For the discerning PvE hunter.