WowAce

Drop the cheapest thing you're carrying

Lightweight but powerful auction house interface

Complete tradeskill information.

Automate Your GDKP Auctions, Bids, & Payouts

Simple and super light-weight tracking of profession links for all your alts.

Keeps track of current money and all your characters on one realm.

Save and send chat messages to many channels. Allows quick item and profession linking within your messages.

A replacement tradeskill window

LDB display of currencies, gold totals and session / daily / weekly statistics for all characters on a server.

Helps you automate selling stuff

LDB data source for currency flow

LilSparky's Workshop mod for Trade Skills

Simplifies GDKP bidding processes

An auction house AddOn to make the life of each fence easier.

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

Replacement for default bags.

Helps you automate selling stuff.

trade history log, recent trade list by [email protected]

Allows for gold tracking across multiple time frames

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...