WowAce

Simple Spell Alert

LDB Broker launcher for HealBot

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

Adds item values to chat messages.

FuBar_KTMFu

Augmented Virtual Reality. Draw and add markers in the 3d world.

Simple font replacement

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

Right-click on minimap blips to open a targeting menu (out of combat).

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

Gives a score for your kit allowing easy comparison with others, also colour codes kit based on appropriateness for your level.

Piece of mind by being one with your class.

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

VendorSearch adds search features when buying items from any vendor

MiniPet, Always keep your little companion with you, based on the work of Carra.

Helps to track outgoing mails

Crowd-control monitor

A simplistic clock.

Buffalo

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)