WowAce

Helps you automate selling stuff

Deformat

WhisperBid

A 'channeling spell'-tracking addon for Affliction Warlocks. Drain Soul, Drain Life/Harvest Life and Malefic Grasp.

Small addon to copy chat lines.

Campaign maps for Warcraft Conquest Moon Guard server

Shows missing buffs and handles welfare and deluxe buffs as one (motw/gotw, blessings, etc.). This lets you see when you nee...

ScoreSort

Customize the PlayerPowerBarAlt display

Flames anyone who lets his debuff expire on Malygos Phase 3

Shows a money overview for your current realm in the tooltip on the money in your bags

KivinSpamGuard

On login, displays changes to your guild since the last time you logged in.

Protractor

Show optimal path for artifact leveling

GearRating

A library that handles the basics of "window" style frames

Shows the price of a single item in the Auction House.

Puts a timer in /yell when you get Unbound Plague during the Heroic Professor Putricide encounter

TwiCo