WowAce

Simple Spell Alert

What did you just loot?

One-click smart mounting.

TrapBar

Add-on that shows which battle pets can be farmed this week

Information display for Hunters.

Light-weight enhanced casting bars

LDB display for Oak Interrupts Broker

Welfare Epics

Displays bars depending on your professions

AltClick an item in your bag to add it a mail, auction, or trade frame, and alt-click to buy a stack if reagents.

Simple and clean Death Knight displays

ShadowGreenLight helps you decide if recasting SWP/Corruption is worthwhile

A data broker plugin showing your longest fight and your current fight time.

A simple data broker display for current Artifact Power

Open those clams (and other containers)

FuBar_ButtonSmashFu

Meeuuuh

RaidHelper

Gives a score for your kit allowing easy comparison with others, also colour codes kit based on appropriateness for your level.