WowAce

Sells all junk in your inventory at once.

A library to provide a markup syntax

XP bar using Ace3.

Configure triggers to send messages to your raid team such as timers, rotations, and health/power based triggers. Raid smarter not harder.

A simple slash-command-based addon for querying item information from the Blizzard servers via ItemIDs and SpellIDs.

Tooltip of awesomeness. Moo. It'll graze your pasture.

Adds mob patrol paths to your map.

Violation

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

Automated smart raid marking to speed up trash clearing in instance runs

StatLogicLib

CT_RaidAssist style raid frames

Collects Herbs, Mines, Gas Clouds and Fishing locations and adds them to the worldmap and minimap

Co-ordinated targetless Party and Raid wipe recovery. Evolved

Adds various information based on PeriodicTable to item tooltips.

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

Try on different gear and see their total stats and their differences. In short, an ingame CT-Profiles-like addon.

Quest History tracker and shows lists of quests in each category

Antagonist

Displays information about the current zone on the World Map for WoW Classic Era