WowAce

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

Tooltip scanning library.

Keeps track of honor, PvP statistics, BG Marks, and Arena points.

Aperture

FuBar_FuXPFu

Keeps track of gold and cash flow across multiple characters

GearRating

A frame designed for each specialization of druid's watching their main power and important buffs/debuffs

T_Tracking

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

RaidSpy

FuBar_CraftTimersFu

BigTrouble

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

TouristLib

Shows learned recipes of all characters.

Adds item values to chat messages.

ItemEnchantApplication

cgCrafty

Keep your pet fed