WowAce

FriendlyArrow

Warn players about a specific aura (buff/debuff) at a specific stack via whispers and icons.

Simple item compare tooltips

Keeps an eye on someone's distance from you, and alerts you if they get too far.

Automate talking with the chatty gnome at Chimaeron's lair

Provides info about spell teaching items.

StopHealingMobs

Status indicator that shows if a unit is hostile (probably mindcontrolled)

FuBar_ChannelwatchFu

Creates an Auctionator's shopping list with all recipes your alts need based on Altoholic data.

Adds a Clear Button to the TradeSkill Search Box.

LibDogTag-Items-3.0

FuBar_InviteFu

Action slot widget for AceGUI-3.0.

Unsolicited

FuBar_TalkFu

Uses linear regression and a log of hitpoint values to estimate how long a boss has left to die and reach execute range.

Yap

Vigilance tracking for Protection Warriors

oUF_HolySmurf