WowAce

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

Note + rep tracking for players, with guild data sharing.

Provides data about all artifacts in the player's possession.

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

Cartographer_Fishing

oUF element for highlighting debuffs that are dispellable by the player

SmartQueue

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

Communicates with guild members for their positions on the world map

What did you just loot?

DreamChat

Quickly assign the highest follower to each building or unassign all of them.

A system config addon to WOW

SliceWatcher

FuBar_LoadLODFu

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

Ghost: Pulse

Crowd-control monitor

Facilitate better communication for loot councils

WeaponRebuff