WowAce

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

Quixote

Embeddable chat throttling library with traffic shaping and priorities

AnchorsAway

Timerbar embeddable library

Library to aid in the classification of Mounts

Library providing mouse-click support for LibQTip-1.0.

SinkLib

A fully featured library tracking all ongoing absorb effects

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

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

Quest information

TableTopLib

Good old LibTourist-3.0 for WoW Classic Era

Party and Raid roster library - one library for any group

Wrapper to convert HealComm data from 3.0 to 4.0

GratuityLib

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

A library to help with localization of Archaeology artifacts

JostleLib