WowAce

Shows simple Buttons for your Cooldowns :)

Tracks, transmits and displays the cooldowns of your raid.

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

Track all threat redirection ability transfers and cooldowns (Misdirection and Tricks of the Trade).

Compact & customizable filtering, monitoring and grouping of buffs and debuffs

Checks your gear before bosses and yells at you if you're an idiot

Adds your damage to Scrolling Combat Text

Visualises healing.

Tracks the HoTs you cast.

A customizable casting bar replacement for TBC Classic & Classic WoW

Provides quick access to information on your group and their equipment, enchant and gem choices.

Violation

A Collection of Automations and Interface Tweaks.

Reports in raid chat whenever a raid member "fails." /EnsidiaFails to configure.

Keeps track of your top hits, heals, criticals, etc.

Sheppard

Gathers statistics on certain chance-on-use spells, also known as procs.

A full package of auras for all 3 Shaman specializations

Tracks vulnerability debuffs on multiple mobs

Disease Tracker for Death Knights.