WowAce

Keeps track of performance of memory, latency, and framerate.

OneBag

Adds a button to the quest completion interface which allows you to auto equips selected quest Item after completion

Angry Boss Reminders helps raiders switch to the proper talents, glyphs, and gear for each boss during a raid.

You've got mail!

Does stuff for sachmo

Friends & Guild Data Broker plugin.

Disease Tracker for Death Knights.

RaidSpy

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

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

Hides MicroButton Alerts

Displays online friends.

Automagical macros for each talent tier.

Embeddable chat throttling library with traffic shaping and priorities

Automatic Refilling of User Defined Items

Cartographer_Routes

Capital Cities NPC Browser

Outdated!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

Loot Distribution System