WowAce

TableTopLib

RaidHelper

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

LDB data source for Tradeskill Cooldowns

Adds a Friendly Fire mode and data collection to Skada.

Add TomTom Waypoints for Flight Masters in classic

Sheppard

Displays bars depending on your professions

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

Saves contents of your guild bank and sends/receives updates over the addon channel

Cartographer_Mailboxes

Simple Spell Alert

Shows skills in a tooltip and allow them to be used. Also keeps track of Cooldowns.

A library to try to guess a level of a player.

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

ElfReloaded

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

Tracks Black Market Auction House auctions.

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

FuBar_KTMFu