WowAce

LibDataBroker plugin showing some random XP related data

SurgeonGeneral Listen CLient

Add lines to ore and gem tooltips that show prospecting sources/results.

Displays the zone level ranage of the zone you are in and also gives you a suggest zone and instances to be in.

Sorts the Wardrobe

Announces interrupts in the chat

FuBar_ModMenuTuFu

Tells you which blob to kill at the Yor'sahj encounter in Dragon Soul.

Customizing your buff display

CraftList

Automatically sells low quality gray items and selected white items to the vendor.

AbacusLib

Adds a button to your character and inspect window that shows a summary of gear enchants and gems.

FuBar_DPS

Displays online guild mates.

Library to help with querying unit talents.

Displays bars depending on your professions

Instant PROC notification

Uses guild notes to add alts' main names to chat windows and other places

In-game EPGP guild helper, supports standby, main/alt shared pools, minEP, offpecGP. Fixed price list with progress multiplier.