WowAce

Replacement for the default UI's StaticPopup dialogs.

Allows you to view all items from all your characters on the same account, when-ever and where-ever you want.

Arena unit frames

Parses ToC and adds About panel to Interface options

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

The original source for where things are in Pandaria

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

Adds a Button to the Worldmap which toggle Handynotes

Another HUD addon

Ackis Recipe List is an addon which will scan your trade skills and provide information on how to obtain recipes. It works fo...

Estimated range display. Type /rangedisplay for config

Shows the possible loot from the bosses

A library allowing for easy creation of graphs

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

Simple Map Mod

Modular damage meter.

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

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

Adds countdown voices from the heroes in Overwatch to BigWigs.

In-game theorycraft. Calculates actual damage/healing based on gear, talents and buffs.