WowAce

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

A 'channeling spell'-tracking addon for Affliction Warlocks. Drain Soul, Drain Life/Harvest Life and Malefic Grasp.

FuBar_switcherFu

SanityItemCache

Shows current/dot cast haste values

What did you just loot?

Shows learned recipes of all characters.

Simple, nice-looking power bar addon for all classes.

BananaBar2

GearRating

Monitor the remaining duration on your Mysterious Eggs and other perishable items.

A fully featured library tracking all ongoing absorb effects

Note + rep tracking for players, with guild data sharing.

A helper addon for the achievements "Let It Snow", "Fistful of Love", "Shake Your Bunny-Maker", "Check Your Head", and "Turkey Lurkey"

Assistance to the dance during Dread Spray

FuBar_tTracker

A simple addon that warns you if your pet isn't attacking while you're in combat.

fmBuffCheck

FuBar_NavigatorFu

Timerbar embeddable library