WowAce

Database of Vendor locations for HandyNotes

Heads-up minimap display

Heads Up Display with Player and Target Info

LittleTrouble

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

Depot

Toggles WoW to the forground on events.

Monitors for friendly deaths and announces them as in Myth: The Fallen Lords

Combat log evolved.

VersionChecker

Helper functions used by my addons, feel free to use them in your addon too

Broken in Midnight. I recommend MidnightFocusInterrupt instead.

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

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

Tankalyze

LDB data source for Tradeskill Cooldowns

FuBar_AmmoFu

Sanity2

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

Buffalo