WowAce

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

DarkCandy

Shows the price of a single item in the Auction House.

A simplistic clock.

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

Adds an additional spell alert if you have more than one charge of a buff that is normally tracked by the in game spell alert...

Simple Spell Alert

Automatically sells low quality gray items and selected white items to the vendor.

Adds predicted lists for spells while the user types

FuBar_AlchemyFu

Adds a Friendly Fire mode and data collection to Skada.

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

Parkour puzzles throughout the world.

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

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

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

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

iTargetingFrames

NCHide

Buffalo