WowAce

Tells your party members when you interrupt stuff, or fail to do so.

Closes chat when the player is instead trying to move

T_RPP

DKFight

FuBar_AlarmClockFu

Minimalistic LDB-based friends display

Adds useful slashcommands for mounting, and more

Checks .lua files for excess and/or involuntary global variable access. NOT AN ADDON.

Broker launcher plugin for Blizzard Equipment Set

BigWigs_ThaddiusArrows

Library that provides a timestamp that is equal across clients' timezones and system clocks

An easy-to-follow guide for visiting all of the Midsummer Festival bonfires.

A customizable buff/debuff display replacement for the default Blizzard frames (with right click cancelaura support).

DaPortrait

Plays a sound when Ready Check fires

LatencyAlert

A library allows animate frame with his children as single object.

PhatLoot

Easy Button for casting MD/ES/ToT etc on tanks.

ElectrofluxTextronator