WowAce

Makes the default frames moveable via simple drag and drop

Give whispers an instant messenger feel.

Enables AceGUI-3.0 widgets for the 5 basic SharedMedia-3.0 types

LibDataBroker-1.1

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!

Show item levels in the character frame

Wowhead Data dump for GatherMate2

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

Adds spec switching support to individual AceDB-3.0 databases.

The original source for where things are in Pandaria

Library providing multi-column tooltips.

A library for transmitting and receiving latency information of players.

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

Modular casting bar.

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

Replacement for the default UI's StaticPopup dialogs.

Tracks rare drops, including companions and mounts