WowAce

Filters unimportant Buffs.

Tracks spiritual innervation on Garajal

MoBuffs

Adds an additional spell alert if you have more than one charge of a buff that is normally tracked by the in game spell alert...

Display fails based on EnsidiaFails filtering options in Skada

SalvationKiller

Shows a countdown bar for the duration of auras (e.g. HoTs, DoTs)

Reports in the Default Chat Frame how many people does not have Well Fed effect, and who are they

Automagically call who should cross over

Tracks if the target does NOT have the tracked DOT.

Assistace for Blackhand (Mortar warning in P2, custom says for bombs and marks in P3)

Keeps track of important de-/buffs in a splash screen

Skin buffs with Masque

A raid buff tracker

Buff and debuff timers with bars or icons.

Check for flask/food buffs

ControlFreak

Shows a frame to track your Pyrite debuff on Flame Leviathan and it's trash. Completely based on MalygosStacks by Nebula.

Never miss an Brain Freeze, Hot Streak or Missle Barrage proc

Envenomous