WowAce

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

Give whispers an instant messenger feel.

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

A Replacement for standard UIDropDownMenu

Adds spec switching support to individual AceDB-3.0 databases.

Library providing multi-column tooltips.

A library for transmitting and receiving latency information of players.

Displays additional information for Mythic Keystone dungeons

Show item levels in the character frame

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

Restores access to removed interface options in Legion

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

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!

Modular casting bar.

The original source for where things are in Pandaria

Replacement for the default UI's StaticPopup dialogs.

Library that handles chat output.

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