WowAce

Timerbar embeddable library

RaidAgent

FuBar_ToFu

Battleground Timers in a HUD around the Blizzard BG status

Tells you who bought your auctions.

Separate indicator for your HoTs with timer.

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

A clone of the FailBot mod. Announces raid member failures such as "Player1 fails at frogger"

Adds the toon name to the alert that your RealID friend has come online.

Piece of mind by being one with your class.

Sanity2

DogChow

A customizable view of friends and guildmates.

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

Hemlock

FuBar_TransporterFu

A library to help with localization of talent trees.

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

QuestAnnouncer

Death reports