WowAce

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.

Give whispers an instant messenger feel.

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

Another HUD addon

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...

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

Restores access to removed interface options in Legion

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.

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

Enables multi-line/unlimited-length pasting of text or commands into WoW

Drop the cheapest thing you're carrying

Enhances the default AddOns list.