WowAce

Manages social information with a focus on main-alt associations.

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

Display an informational fighter jet style HUD while flying or riding

Tells you the Tiller, what food they like, and if you have fed them today for the quests A Dish for ...

Friends & Guild Data Broker plugin.

Display front-end for LibGuildPositions-1.0 using HandyNotes

Show what quests have changed

Adds talent specialization role status to Grid.

A Data Broker display for combat statistics.

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

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

Enchanting data for Ackis Recipe List.

A library to help with localization of talent trees.

aX_RaidStatus

A tool to appraise, estimate, or judge your equipment against the equipment of others.

EasyDKP

Pet Theory

LilSparky's Workshop mod for Trade Skills

WeaponRebuff

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