WowAce

Chat addon, filtering messages and UI changes

A library for transmitting and receiving latency information of players.

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

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

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

Displays additional information for Mythic Keystone dungeons

Give whispers an instant messenger feel.

Library that handles chat output.

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

Replacement for the default UI's StaticPopup dialogs.

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

Parses ToC and adds About panel to Interface options

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

The original source for where things are in Pandaria

Show item levels in the character frame

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

Restores access to removed interface options in Legion

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

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