WowAce

Enable/Disable addons for your character in game

Warns you with sounds when you gain different shaman spells.

ArenaPointer

PreferredItems

Saves contents of your guild bank and sends/receives updates over the addon channel

Interface-central mount management

Campaign maps for Warcraft Conquest Moon Guard server

Meeuuuh

Simple library that handles multiple levels of logging.

GridLayoutPlus

Draws some lovely 3D portraits in the standard Blizzard artwork.

Allows customisation of login/logout system messages.

T_ItemInfo

A library to help with localization of Archeology dig sites

Should I send that recipe to my alt?

Keeps a list of all items you want and shows how much you need.

nRaidTracker

Reminds you to Life Tap and Dark Pact

Makes tracking reputation much simpler. By InSo(v)nIaX

FuBar_NavigatorFu