WowAce

Calculates incoming damage avoidance and mitigation

SwapMagic

Gives a Smoother Quest Experience

Swiss Army knife for instances, including player tracking, ignore buttons, loot tracking, notes, and more.

For Developers (of Addons which uses LibWho-2.0): show queues and queries in realtime

This will keep track of how much you have paid per item in your inventory. Only one of (Auctionator, Auctioneer, AuctionLite,...

Dailies Quest Tracker

Makes the message dialog movable

Control screenshot format and quality via LDB displays

Customizing your buff display

Adds resurrection and soulstone status to Grid, using LibResComm-1.0.

Outdated! Please use 'XLoot', available on Curse and WoWI

FuBar_UIReloadFu

Allows you to loot BoP items without prompting when not in a group or raid

tekSupport

NRT_EPGP

Show extra information about Jewels and Enchants in tooltips.

Scans your Equipment for cumulative item bonuses and sums them up.

SupplyAndDemand

Keeps track of resurrection spells cast in a group