WowAce

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

Good old LibTourist-3.0 for WoW Classic Cataclysm

Minimap addon of awesomeness. *chewing sound*. It'll nibble your hay pellets.

Death analysis tool

Show where the chests are for Withered Army Training

Show all the orbs for triggering Kosumoth

Timers for Buffs, DOTs, CC effects, etc..

Books in Azsuna? Sure, why not?

Displays the locations of the chests for the Treasure, Treasure Everywhere achievement

One large inventory.

XP bar using Ace3.

A library to provide a markup syntax

Automatically enables or disables combat logging based on location.

Lightweight but powerful auction house interface

A library to provide unit-oriented tags to LibDogTag-3.0

Kiwi Plates

Archaeology Assistant

Collectinator is an addon which will scan your pets and mounts and provide information on how to obtain them.

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

Item stat breakdown, analysis and comparison