WowAce

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

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

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

Deus Vox Encounters

Smooth combat HUD based on ArcHUD2

A bar style display for broker plugins. Formerly ChocolateBar. Alternative to Fubar, Bazooka, TitanPanel, Fortress, ...

Find five Ephemeral Crystals, get a pink hippogryph

Unit Frames of awesomeness. Woof. It'll bite your face off.

Show the transmog appearance of an item when you mouse over it, and shows collection-status in bags, shops, and elsewhere. Works on transmog, mounts, pets, and decor.

Display auras on action buttons.

The Talent Template Editor

StarTip (Tooltips from Outerspace)

Bulk mail reception made really easy

Library providing mappings between trade skill recipes, spells and created items

LiteStep skins for Masque.

Create panels for customizing your UI, sucessor to eePanels

Keeps account of attendance and loot for raids, parties, bgs, arenas and solo for questing.

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

Enables multi-line/unlimited-length pasting of text or commands into WoW

AutoMagicly clicks though Daily Quests, and Turns them In.