WowAce

Debuff Monitor: A Powerful & Configurable Raiding Tool

Outdated! Please use 'XLoot', available on Curse and WoWI

Database of your death locations for HandyNotes

Capital Cities NPC Browser

Handles the assignment, coordination, and announcement of many parts of the Lich King encounter in Icecrown Citadel.

QR Code builder library

Fancy up the PlayerPowerBarAlt frame

FuBar_SoulJarFu

Enables the filtering of items when you visit a vendor

MoBuffs

xchar

Shows you which bosses you've killed next to the raid finder frame.

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

Adds resurrection, resurrected and soulstone status to Grid2. Uses LibResComm-1.0

Resizes some default UI frames (GuildUI, LootFrame, RaidInfo, TradeSkillUI and TrainerUI) to show more lines

LDB Broker launcher for HealBot

ItemRackFu

Instant PROC notification

BuffProtectorGnome

A PitBull4 module which shows an arrow that points to raid members