WowAce

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

Postal: Enhanced Mailbox support

A library for transmitting and receiving latency information of players.

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

A library allowing for easy creation of graphs

Modular casting bar.

Keeps track of group members and keeps an up-to-date cache of their specialization and talents.

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

Restores access to removed interface options in Legion

Database of item upgrade IDs

Displays additional information for Mythic Keystone dungeons

Library that handles chat output.

Chat addon, filtering messages and UI changes

Tracks rare drops, including companions and mounts

Show item levels in the character frame

Makes the default frames moveable via simple drag and drop

Replacement for the default UI's StaticPopup dialogs.

The original source for where things are in Pandaria

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

Parses ToC and adds About panel to Interface options