WowAce

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

A library for transmitting and receiving latency information of players.

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

Simple and Advanced combined - Bartender4 ActionBar AddOn

Collects Herbs, Mines, Gas Clouds, Archaeology, Treasure and Fishing locations and adds them to the worldmap and minimap

Makes the default frames moveable via simple drag and drop

Give whispers an instant messenger feel.

Displays additional information for Mythic Keystone dungeons

Collects Herbs, Mines, Gas Clouds, Archaeology, Treasure and Fishing locations and adds them to the worldmap and minimap

Library that handles chat output.

Replacement for the default UI's StaticPopup dialogs.

Simple AceGUI3 dropdown item classes for font/statusbar/sound/etc.

Parses ToC and adds About panel to Interface options

The original source for where things are in Pandaria

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

Tracks Raid/Instance/World Boss lockouts for all your characters, daily/weekly quests, currencies, trade cooldowns, and more!

The original HandyNotes source for where things are in Battle for Azeroth

Show item levels in the character frame

Restores access to removed interface options in Legion

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