WowAce

Highly-configurable shield / absorb tracker.

fmBuffCheck

Auto roll greed, need, pass or manually roll on items.

Announces Mage Spells in chat.

Shared handling of media data (fonts, sounds, textures, ...) between addons.

Mark My Words

Raid loot system.

Doublerightclick casting, autolure and sound enhancing

Provides information of tradeskill and crafting materials that are in the banks and bags of your characters.

Aspect checker addon for Hunters.

EnchantList

Adds World Quests to the quest list

lugMD

EQCompare

Don't underestimate your little critters!

FuBar_CRDelayFu

FuBar_ShardCountFu

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

A library to return spell duration and debuff type of a spellID.

Considers an item against all the items you have to determine whether or not it is an upgrade