WowAce

cgCrafty

Allows for gold tracking across multiple time frames

Auto sizes frame layout depending on group/raid size or predefined zone data

A FPS Data Broker plugin.

RicoMiniMap

Allows you to prevent addons from sending and receiving messages.

Tells you who bought your auctions.

Instant SLAM! notification

Keeps track of gold and cash flow across multiple characters

On login, displays changes to your guild since the last time you logged in.

Adds item values to chat messages.

Sneakily inspect how much gold your mouseover target has made so far.

A tool to appraise, estimate, or judge your equipment against the equipment of others.

Adds Name and Buyout Price sort columns to the auction house.

Uses guild notes to add alts' main names to chat windows and other places

FuBar_TransporterFu

Add a line to herb tooltips that shows what pigment they produce.

A Mount and Companion manager

Creates a broker plugin for all your broker launchers

Battleground Timers in a HUD around the Blizzard BG status