WowAce

Reports on a configurable dashboard or to group chat on consumables, buffs, AFK, mana and many many others but in an intellig...

Estimated range display. Type /rangedisplay for config

Rep2 displays a message, which shows how much reputation you gained, and how much is needed until the next standing.

RicoMiniMap

RootsBidder

Embeddable library to track raid/party roster

SRA

Sells all junk in your inventory at once.

Inserts some media into LibSharedMedia's storage.

Inserts additionnal fonts into SharedMediaLib's storage.

Sheppard

AutoMagicly clicks though Daily Quests, and Turns them In.

Scan for rare mobs so you can find them and their loot

Rebuff yourself with the mousewheel.

Tweak the tradeskill windows

An extension to the default WoW Unit Frames.

A replacement tradeskill window

Changes the look of the default UI

Calculates and shows your TankPoints in the PaperDall Frame.

Shift-clicking on a user name in chat shows a tooltip with their whois information.