WowAce

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

A library for transmitting and receiving latency information of players.

Chat addon, filtering messages and UI changes

Toss those bugs inna sack.

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.

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

Restores access to removed interface options in Legion

Library that handles chat output.

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

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

Displays additional information for Mythic Keystone dungeons

The original source for where things are in Pandaria

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

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

Replacement for the default UI's StaticPopup dialogs.

Parses ToC and adds About panel to Interface options

Show item levels in the character frame

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