WowAce

Database of item upgrade IDs

"Debug" code free since '93!

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

Replacement for the default UI's StaticPopup dialogs.

The original source for where things are in Pandaria

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

Simple Map Mod

Parses ToC and adds About panel to Interface options

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

Another HUD addon

Give whispers an instant messenger feel.

Estimated range display. Type /rangedisplay for config

Shows the possible loot from the bosses

Simple and super light-weight tracking of profession links for all your alts.

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

Modular damage meter.

Myslot is for transferring settings between accounts. Feedback [email protected]

Addon to manipulate the map

Changes the look of the default UI

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