WowAce

What did you just loot?

Control screenshot format and quality via LDB displays

Allows you to prevent addons from sending and receiving messages.

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

Facilitate better communication for loot councils

A menu with useful searches for Inventorian

A system config addon to WOW

SmartQueue

GetInLine

Adds options to create customized layouts from within grid.

Evaluates your gear

SwapMagic

On login, displays changes to your guild since the last time you logged in.

Speeds up triggering actions such as items or spells by triggering them on key/mouse down rather than release

Crowd-control monitor

SliceWatcher

XP and Reputation bars

Nudge

Makes tracking reputation much simpler. By InSo(v)nIaX

SanityItemCache