WowAce

Raid Cooldowns

Disease Tracker for Death Knights.

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

WeaponRebuff

Highly-configurable shield / absorb tracker.

Prints a message in your default chat frame when someone in your group gains an aura.

Ghost: Pulse

Reminds you if your flask/elixir and/or Augmentation Rune and/orfood buff is about to expire or has expired

rSelfCast

Information display for Hunters.

A frame designed for each specialization of druid's watching their main power and important buffs/debuffs

Visual Raid Cooldown Tracking

Warns you with sounds when you gain different shaman spells.

Allows you to create icons, which can be customized greatly by user's input. CiR is more than just the usual cooldown tracker.

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

Instant PROC notification

Crowd-control monitor

DebuffEnough

Audible Alerts for self-gain, self-lost, any-gain, all-lost of statuses.

Buff reminders and more