WowAce

Tracks interrupts

Enables user defined sounds for Party, Guild, Raid and Custom Channel chat messages.

Lightweight time/date display with optional hourly chime.

Auto roll greed, need, pass or manually roll on items.

Insanity resource tracker for shadow priests.

adds navigation buttons to Encounter Journal

Allows for easy congratulating when someone earns an achievement.

Tracks the current Fear Ward's in the raid or party.

LDB data source for Tradeskill Cooldowns

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

Combination of Titan LootType and Roll - stripped down and cleaned up.

Reno is a slash-command that can patch predefined options in a macro to change which abilities will be chosen.

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

Smart raid loot and DKP tracker with automated standby and learning

Check the quality of wild battle pets

Hides MicroButton Alerts

Tracks skill and tradeskill costs and progressions, as well as trainer locations.

Keeps track of performance of memory, latency, and framerate.

RaidSpy

Adds predicted lists for spells while the user types