WowAce

Adds your name to chat messages

Loudmouth

Improved Quest Tracker

Privacy2

Tracks whispers and conversations

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

Tracks SendAddonMessage Spam

Shows Chat as Combat Text

Captures chatframe Tradeskill Links for later reference in an easy to read format

FuBar_ChatAlertsFu

Allows you to prevent addons from sending and receiving messages.

Desesperated announcing to clearly show the skillings of act inplay.

Allows customisation of login/logout system messages.

Automate Your GDKP Auctions, Bids, & Payouts

Enables cooldown notification between players and allows party members access to each-others spell books.

Crowd-control monitor

Shows activity for hidden ChatFrames by making their tabs flash.

A clone of the FailBot mod. Announces raid member failures such as "Player1 fails at frogger"

DreamChat

MonkeyPirate