WowAce

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

Gives equipped and overall iLvl to indicate the quality of a character's gear.

Inventory and bank organizer.

Toggle addon configuration mode.

Track any items you want in a tooltip

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

Shows your FuBar addons in your LDB display.

Adds a Friendly Fire mode and data collection to Skada.

Spawns toasts for looted items, money, and currencies.

Hides the Order Hall Command Bar

TuiRaidTracker

Bidder for DKP points. Usable as standalone bidder, or with DKP - Manager to manage points.

A fully featured library tracking all ongoing absorb effects

SacredBuff

Manages tracking of raid attendance, loot, and more.

Displays a grid of guild ranks versus permissions.

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

GUI Configuration Library

provides enchanters with a decent tool for managing their profession

SurgeonGeneral