WowAce

Automatically enables or disables combat logging based on location.

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

Set and manage character notes that are displayed in unit tooltips and /who results.

Changes the look of the default UI

Entropy skins for Masque.

Adds countdown voices from Heroes of the Storm to BigWigs for all supported locales.

LiteStep skins for Masque.

Drop the cheapest thing you're carrying

A library to determine estimated range.

Enhances the default AddOns list.

Database of item upgrade IDs

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

Libra

OneBag is a replacement for the default game bags that combines all the bags into one frame.

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

A lightweight, flexible, multi-target threat meter.

LibItemInfo-1.0

Display Cooldown Count of Spell Icon and Item

Replaces the normal unit, party, target, pet frames and adds target-of-target.

Smooth combat HUD based on ArcHUD2