WowAce

Quest information

Quixote

Timerbar embeddable library

Library to help with querying unit talents.

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

Embeddable chat throttling library with traffic shaping and priorities

Library to aid in the classification of Mounts

AnchorsAway

A library to handle rearrangement of blizzard's frames when bars are added to the sides of the screen.

Keeps track of healing spells cast by everyone in a group.

A fully featured library tracking all ongoing absorb effects

A library to help with localization of Archaeology artifacts

SinkLib

Library providing mouse-click support for LibQTip-1.0.

Test whether the player can really dispell a buff or debuff, given its talents.

Wrapper to convert HealComm data from 3.0 to 4.0

Manages the scanning of the auction house in a reliable an efficient manner.

Party and Raid roster library - one library for any group

TableTopLib

Manages the SavedVariables of your addon with a layered hierarchy of settings.