WowAce

Give whispers an instant messenger feel.

Simple and Advanced combined - Bartender4 ActionBar AddOn

Creates and manages secure Action Buttons

A powerful, comprehensive utilty for displaying graphics and information based on buffs, debuffs, and other triggers.

Displays information about the current zone on the World Map, for WoW TBC Classic

Good old LibTourist-3.0 for WoW Classic Mists of Pandaria

Inventory Management with virtual bags divided into sections.

AddOn development framework

The original source for where things are in Pandaria

A skinning engine for button-based add-ons.

Chat addon, filtering messages and UI changes

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

Wowhead Data dump for GatherMate2

Handy notes for your maps

A friendly companion that remembers the chat.

Mutes various chat related annoyances while in capital cities and instances.

Changes the look of the default UI

Automatically turns on the combat log for selected raid and mythic+ instances.

Another HUD addon

Auto repair + shows durability.