WowAce

Reno is a slash-command that can patch predefined options in a macro to change which abilities will be chosen.

Friends & Guild Data Broker plugin.

Square Minimap and more

LibDogTag-2.0

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

Provides database of quest giving npcs/mobs/objects for display on the World Map/Minimap

ClassColors

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

Pet Theory

Library providing mappings between trade skill recipes, spells and created items

Tracks profession specific cooldowns and items across all your characters

Timerbar embeddable library

Utility library with shared functions and data for various addons by NeoTron.

Creates a broker plugin for all your broker launchers

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

A library to help with localization of talent trees.

Replacement for default bags.

Adds talent specialization role status to Grid.

Show what quests have changed

Display front-end for LibGuildPositions-1.0 using HandyNotes