WowAce

StatLogicLib

A library to provide a markup syntax

A library to help with localization of races.

A library to provide unit-oriented tags to LibDogTag-3.0

Library that tracks incoming heals

Queing of /who and SendWho() queries and a much better interface (see docs), with gurantee to be executed & callback.

IncomingHealsLib

A library to provide information about zones and instances.

Database of Diminishing return categories and general data

Talismonger-3.0

A library for PvP and Battlegrounds

Provides one or many informational windows with optional interactive widgets.

Various libraries based on LCD4Linux, offering users lower-level UI customizations.

A library to help with localization of Zones.

Does stuff for sachmo

A library to provide a clean dropdown menu interface.

TabletLib

Some handy events that should exist in the default UI

ItemBonusLib

an embeddable library providing an abstraction layer for tracking and querying Blizzard's Nameplate frames with ease and effi...