WowAce

Tools for MultiBoxers or Group questing/leveling

Provides LibPeriodicTable-3.1 item filters for AdiBags.

Displays online guild mates.

Announces interrupts in the chat

Shows you the radius of your totems.

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

Fixes strata bugs in UI windows

Add-on that shows in a unit tooltip window a number of killed mobs of the same kind

Allows you to prevent addons from sending and receiving messages.

Shows your FuBar addons in your LDB display.

Hemlock

SurgeonGeneral

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

Klappa

CombatLog in SimpleCombatlog style

Allows customisation of login/logout system messages.

Guilder brings common guild-raid tasks together in one convenient place.

Keeps track of durability and pops up a dialog to repair when you go to a vendor who can.

Adds a button to the quest completion interface which allows you to auto equips selected quest Item after completion

Friends list improvements: notes, remembering the information of offline friends, friend list syncing and backups, and a fuba...