WowAce

Give whispers an instant messenger feel.

Another HUD addon

A modular, lightweight and screen-estate saving grid of party/raid unit frames

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

Provides access to all Portal and Teleport spells on right click of one button.

Show the transmog appearance of an item when you mouse over it, and shows collection-status in bags, shops, and elsewhere. Works on transmog, mounts, pets, and decor.

Changes the look of the default UI

Tracks rare drops, including companions and mounts

Scan for rare mobs so you can find them and their loot

Officially the original source for where things are in the Broken Isles, in HandyNotes

Show a texture on demand

Auto repair + shows durability.

Tracks herbs/ore/items that can be broken into component pieces

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

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...

an embeddable library providing an abstraction layer for tracking and querying Blizzard's Nameplate frames with ease and effi...

Restores access to removed interface options in Legion

Barks at you when you target a crowd-controlled unit

A skinning engine for button-based add-ons.

Watch tooltip updates to announce when you find specific objects