Prat
Prat is a framework for chat ehancement modules.
Mists of Pandaria 
The Burning Crusade 
Vanilla 
Wrath of the Lich King Addon Details
Expansion
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Prat-3.0 is a chat enhancement addon for World of Warcraft 3.0. It is made up of 30+ smaller “modules” which each provide additional functionality and can be enabled or disabled individually.
In game, type /prat for a menu.
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Cataclysm
4.3.4More addons for Cataclysm
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Chef Time
Displays who does not have the food buff "Well Fed" and elixir/flask buffs.
ISpy
Monitors when harmful spells are removed, interrupted or stolen.
xanDebuffTimers
A small text based progress bar system for target debuffs.
GTFO
Reminds you when you are standing in stuff that can kill you.
Examiner
Advanced Inspection Mod of Gear, Talents, Honor, Arena and Achievements.
SimpleDing
Ding!
DebuffFilter
Filter out specific debuffs and buffs into separate frames.
RaidAchievementFilter
Allows you to see what achievements there are for the instance you are in.