WowAce

Nihilum Raid Tracker, originally written for the EU guild Nihilum.

NameTagToggle

Keeps track of performance of memory, latency, and framerate.

RaidAgent

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

Provides database of quest giving npcs/mobs/objects for display on the World Map/Minimap

Need Greed window for EPGP lootdistribution.

FuBar_FuXPFu

Enchanting data for Ackis Recipe List.

MainAssist

GUI Configuration Library

NShakedown

Track of your tradeskills across characters, create small buttons for them and track cooldowns.

Entertaining kill-shot notification.

Fubar_ChannelWatchFu remade for Broker

Doublerightclick casting, autolure and sound enhancing

TrackingBar

Displays item durability and repair cost.

Suppresses chat messages from damage meters and provides single chat-link damage statistics in a popup.

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