WowAce

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

Modular casting bar.

Afflictions display and cleaning for solo, group and raid with advanced filtering and priority system.

Tracks Raid/Instance/World Boss lockouts for all your characters, daily/weekly quests, currencies, trade cooldowns, and more!

Estimated range display. Type /rangedisplay for config

In World of Warcraft healers have to die. This is a cruel truth that you're taught very early in the game. This add-on helps you influence this unfortunate destiny in a way or another depending on the healer's side...

Arena unit frames

Modular damage meter.

Death analysis tool

A lightweight, flexible, multi-target threat meter.

Makes a sound when your focus starts casting. Use with [target=focus] macros for interrupts (Counterspell, Spell Lock, Wind ...

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

Automatically enables or disables combat logging based on location.

Numerical and graphical display of Combo Points and similar buffs/debuffs. Also tracks Holy Power and Soul Shards.

Automatically turns on the combat log for selected raid and mythic+ instances.

Show buffs on nameplates.

Displays the remaing cooldown of the action you tried to use

Kiwi Plates

Fires events whenever a raid member "fails."

In-game theorycraft. Calculates actual damage/healing based on gear, talents and buffs.