WowAce

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

Adds spec switching support to individual AceDB-3.0 databases.

A library for transmitting and receiving latency information of players.

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

Makes the default frames moveable via simple drag and drop

Chat addon, filtering messages and UI changes

Library that handles chat output.

Give whispers an instant messenger feel.

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

Replacement for the default UI's StaticPopup dialogs.

Displays additional information for Mythic Keystone dungeons

Parses ToC and adds About panel to Interface options

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

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

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

The original source for where things are in Pandaria

Restores access to removed interface options in Legion

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

Officially the original source of knowledge of where things are in Draenor during Warlords, in HandyNotes

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