WowAce

Lets you drag UI frames around

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

Tooltip scanning library.

iTargetingFrames

NCHide

HazLoot

Tracks Black Market Auction House auctions.

Raid level alternative player power warning (Atramedes, Cho'gall, Lord Rhyolith)

Simple font replacement

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

Filters AFK and DND messages after you've seen them once.

A simplistic clock.

Taggle

FuBar_AEmotesFU

LDB data source for Tradeskill Cooldowns

Sheppard

Hotkey interface for spells, macros, other clickables.

GemCensus inspects people and records which gems they have socketed. Then displays which gems are the most popular.

Shows skills in a tooltip and allow them to be used. Also keeps track of Cooldowns.

Simple Spell Alert