WowAce

Adds two icon indicators to each corner (total: 8 icon indicators).

CBRipoff

Improved Quest Tracker

Embeddable chat throttling library with traffic shaping and priorities

adds navigation buttons to Encounter Journal

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

Provides LibPeriodicTable-3.1 item filters for AdiBags.

Adds on-screen buttons for the farming tools and seeds.

FuBar_RLAssistFu

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

Niagara

A simple range indicator for optimizing Halo damage.

Captures chatframe Tradeskill Links for later reference in an easy to read format

A jukebox for playing wow embedded music.

Provides the ability to suppress specific spellcasts like "Deaden" from your casting bars.

Shows activity for hidden ChatFrames by making their tabs flash.

Short EPEEN

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

SinkLib

Simple and clean Death Knight displays