WowAce

Advanced Chat Filtering and Spam Blocking Addon

Adds a button to the quest completion interface which allows you to auto equips selected quest Item after completion

SwapMagic

xchar

Displays online guild mates.

EquivalencePoints

Go quick, or go home!

Provides quick notification (sound and visual) of your tanking status of your current target. Meant for tanking.

A boss encounter engine used by other add-ons

Spyglass

Light-weight enhanced casting bars

Accelerates Camera Zooming

Assistance to the dance during Dread Spray

Control screenshot format and quality via LDB displays

Keeps track of healing spells cast by everyone in a group.

A customizable casting bar replacement for TBC Classic & Classic WoW

Displays oRA3 main tanks.

Adds achievement reminders to BigWigs

PartyToGo

Records mail when visiting the mailbox to make keeping track of mail and expiration dates easy.