WowAce

LibItemInfo-1.0

A library to provide a markup syntax

Library that tracks incoming heals

Babble-2.2

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

A library to help with localization of in-game subzone names.

Database of Diminishing return categories and general data

Database of item upgrade IDs

Provides one or many informational windows with optional interactive widgets.

A library to provide information about zones and instances.

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

A library for PvP and Battlegrounds

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

A library to help with localization of Zones.

A library to provide a clean dropdown menu interface.

A library to determine estimated range.

Talismonger-3.0

Fires events whenever a raid member "fails."

Additional information about player spells.

Some handy events that should exist in the default UI