Skada is a modular damage meter.

Modular, lightweight, non-intrusive approach to boss encounter warnings.

Adds Scrolling Combat Text above your character.

Based on RougeUI. Features numerous visual and quality-of-life tweaks.

An ElvUI modification that prevents a crash on Project Epoch.

Create virtual and audio alerts for any situation in the game.

A simple Add-on that rings when you hover or target an enemy healer.

Estimated range display.

DBM for Whitemane (Frostmourne)

Allows you to execute a sequence of macros without stopping on unusable spells.

A sexy logarithmic cooldown bar.

Killshot is a simple addon that will display a message each time you make a killing blow.

Aesa helps you track enemy cooldowns.

Helps you keep track of your CDs and casted abilities.

An enhanced backport of Blizzard's Loss of Control alerts for WoW 3.3.5. Big new feature is it auto detects CC that isn't in the list currently. It adds a lot of CCs throughout time.

Arena addon designed to track the global cooldowns (GCDs) of arena1, 2, 3, 4, and 5

Displays duration timers for DoTs/HoTs, cooldowns, and your buffs/debuffs.

Shows casting bars for party members

Shows you the recently used abilities by your party & arena members.

sArena for Ascension Bronzebeard/Malfurion.

Alerts you whenever your target casts spells.

Raid cooldowns addon for 3.3.5a

Alerts you when a Boss begins to cast certain spells or use certain skills.

Reports consumables, buffs, AFK, mana and many many others but in an intelligent automagic way.