WowAce

AMPFu

Compact scrolling vendor frame

A Healing Assignment management addon

Baggins_BtmScan

Addon to manage WoW titles.

Notifies you of new calendar event invites and reminds of upcoming events on all characters and realms

Managing and viewing loot-type rolls

Add in keybindings to place raid marks on mouseover, or the target if there is no unit being moused over

Allows communication to be shared across realm through Battle.net.

This is an add-on to block incoming guild/party/duel requests (except for friends/party/guild) (previously ASSBlock)

Adanced Achievement Tracker is a smal tool to track Achievements

Reports in raid chat whenever a raid member "fails." /EnsidiaFailsWotLK to configure.

Thok Cooldown Rotation

Minimal KoS-list-addon

Provides additional graph mode report for Acheron

GigaItemAuction

Makes it very easy to collect rare battle pets.

FuBar_InviteFu

Out of Mana bar.

Simple embeddable publish-subscribe implementation.