WowAce

Database of important locations for HandyNotes

Heads-up minimap display

Database of Vendor locations for HandyNotes

FuBar_ToFu

Fubar_ChannelWatchFu remade for Broker

Heads Up Display with Player and Target Info

Role playing AddOn that shows extra information about characters as entered by the player.

Broken in Midnight. I recommend MidnightFocusInterrupt instead.

Tankalyze

Mutt (Macro Update Target Tool) provides slash-commands that can patch the predefined targets in your macros.

A simple interface for unitframe click casting.

Allows tradeskill usage by clicking items or reagents.

VersionChecker

FuBar_AmmoFu

Manages tracking of raid attendance, loot, and more.

Combat log evolved.

Automates bites during the Blood-Queen Lana'thel encounter in Icecrown Citadel

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

Toggles WoW to the forground on events.

Manages social information with a focus on main-alt associations.