WowAce

Adds your name to chat messages

Uses guild notes to add alts' main names to chat windows and other places

Creates new chats with guild channel functionality

Tracks and announces interrupts (eg. Hit/Miss/Immune) and is also able to track and report "wasted" interrupts (those which d...

Enigma

Checklist and notes addon.

Improved Quest Tracker

Saves who searches in a favorites list.

TwiCo

Shows Chat as Combat Text

Displays online guild mates.

Crowd-control monitor

Enables you to see Chinese, Japanese and other languages in game

Restores channels and channel-window associations after disconnects remove them.

Adds item values to chat messages.

MiniChat

ViewAddonMessage

It's a doodle pad for doodling with doodles.

Vox

vChat