WowAce

Make the unit frame fade if out of range.

Splut

Add-on that shows which battle pets can be farmed this week

Adds pipes which can control arbitary other statuses (like toggle status on key or "in combat"-state).

Adds achievement reminders to BigWigs

Simple and rich Death Knight rune customizations

QuestAnnouncer

Deformat

oUF element for highlighting debuffs that are dispellable by the player

Small addon to copy chat lines.

Toggles player names.

Manages the scanning of the auction house in a reliable an efficient manner.

Tooltip scanning library.

SacredBuff_Mounts

SurgeonGeneral Listen CLient

lugMD

A tool to appraise, estimate, or judge your equipment against the equipment of others.

Reverse Engineering will drill down and search your tradeskills for their elements

SmartQueue

Allows the user to customize the the tooltip with lua-scripts