WowAce

New/Old BG indicator, Join by ID, Quick Leave Queue, etc.

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

Death reports

LDB data source for currency flow

RaidSpy

RaidInfo

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

Adds party/raid role icons in useful places

Insanity resource tracker for shadow priests.

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

WhoDrop

IncomingHealsLib

adds navigation buttons to Encounter Journal

Questing minion

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

Pins on the World Map for quests you have not completed yet

Cancellation

Loudmouth

Raid loot tracking and text generation

A collection of Rogue modules.