WowAce

PiraPlex

Displays both Kalecgos and Sathrovarr the Corruptor hit points during the encounter.

Advanced Chat Filtering and Spam Blocking Addon

Calculates incoming damage avoidance and mitigation

Checklist and notes addon.

Allows custom-triggered boss mod timers to be created

Assist you with faction transfers letting you know which mounts, spells, etc you have and what they will be swapped to.

Utilities for pixel perfection, decimal to hex, parsing item strings

Hides MicroButton Alerts

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

TGuildFrame

Allows frames to be dragged around, without permanently changing their position.

Collects and displays census information. This AddOn is licenced under the GNU GPL, see GPL.txt for details.

LibGUIFactory-1.0

Sets you to DND when you fight a boss, and some other crap.

DelMapa

"Shows Call To Arms status in an LDB data provider."

SacredBuff_Mounts

Communicates with guild members for their positions on the world map

CleanShot