WowAce

Minimap addon of awesomeness. *chewing sound*. It'll nibble your hay pellets.

Checks Raid Buffs/Flasks/Consumables. Tunable alerts for misdirects, taunts, cc breakage, rez, dispel and interrupt

Static library of wow map data

Lightweight Chat Improvements

Bulk mail reception made really easy

Marks the locations of Midsummer Fire Festival bonfires on the worldmap and minimap.

Complete tradeskill information.

Provides one or many informational windows with optional interactive widgets.

Unit frame addon using Ace3.

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

Drop the cheapest thing you're carrying

Floating Combat Text of awesomeness. Caw. It'll eat your crackers.

Point to quest POIs on your minimap

Watches your chat, flagging missplled words, and offering correctly spelled suggestions.

Timers for Buffs, DOTs, CC effects, etc..

Reports on a configurable dashboard or to group chat on consumables, buffs, AFK, mana and many many others but in an intellig...

Lightweight but powerful auction house interface

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

OneBag is a replacement for the default game bags that combines all the bags into one frame.

Plugs classical world style fonts into LibSharedMedia-3.0