WowAce

Drop the cheapest thing you're carrying

Complete tradeskill information.

Lightweight but powerful auction house interface

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

Automate Your GDKP Auctions, Bids, & Payouts

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

A replacement tradeskill window

Helps you automate selling stuff

LDB data source for currency flow

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

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

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

Helps you automate selling stuff.

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

Simplifies GDKP bidding processes

LilSparky's Workshop mod for Trade Skills

Replacement for default bags.

Collects, analyzes and presents information about the virtual economy.

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

Helps to track outgoing mails