WowAce

TabletLib

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

Insanity resource tracker for shadow priests.

IncomingHealsLib

Adds party/raid role icons in useful places

Displays friend notes in unit tooltips, at logon, and in /who results.

Death reports

Tracks vulnerability debuffs on multiple mobs

RaidInfo

Role playing AddOn that shows extra information about characters as entered by the player.

WhoDrop

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

A collection of Rogue modules.

RaidSpy

A simplistic clock.

Klappa

Displays reagent count on spell action buttons

Raid loot tracking and text generation

Detects specific CDs and spellcasts

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