WowAce

Makes the message dialog movable

FuBar_EmoteFu2

A tool to appraise, estimate, or judge your equipment against the equipment of others.

Persists collapsed state of headers across wow sessions.

Heads Up Display with Player and Target Info

Modifies the inbox into a scrollable inbox, including open all options

Adds aura indicators to unit frames

Whats

StitchUI

Right-click on minimap blips to open a targeting menu (out of combat).

EUF is an enhance of wow original unit frames, provides hp with both value and %, and optional 3D portrait. Simple and Useful.

Tracks whispers and conversations

Keeps track of healing spells cast by everyone in a group.

Artifact power bar support for oUF layouts

ClassColors

Allows for gold tracking across multiple time frames

Saves contents of your guild bank and sends/receives updates over the addon channel

Library providing mouse-click support for LibQTip-1.0.

A menu with useful searches for Inventorian

MiniPet, Always keep your little companion with you, based on the work of Carra.