NeedToKnow
Timer bars for buffs, debuffs, cooldowns, etc.
Mists of Pandaria 
The Burning Crusade 
Wrath of the Lich King Addon Details
Expansion
Mists of Pandaria Categories
Developers
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NeedToKnow tracks dots, debuffs, cooldowns and spell usability. You can use it for something as simple as tracking one dot on one target or something as advanced as an internal cooldown on one of your trinkets.
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