Cooldown Addons

CoolLine

CoolLine is a spell/item cooldown mod that displays icons on a single bar/line to give you an idea of when it will be ready. No statusbar timer and no text timer. CoolLine is inspired by Forte_Cooldown (a module in the ForteXorcist package). CoolLine is basically a stripped down and standalone version written from scratch. The name comes from putting "cooldown" and "timeline" together (yes, lame).
Config: /coolline
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CooldownButtons

Monitor all active Item or Spell(incl. Pet) Cooldowns as Buttons. Grouping Buttons for Items and Spells in its own Button Bars.
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Doom_CooldownPulse

Ever wanted to know when a certain ability will come off cooldown, but you're too caught up in a fight to notice? Doom_CooldownPulse is designed to fix that problem! It flashes the icon of the ability in the middle of your screen whenever it becomes usable again.
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NameplateCooldowns

This AddOn will show you selected cooldowns of enemies above their nameplates. NameplateCooldowns does not contain a single piece of code from Icicle, but was inspired by it. Compatible with Tidy Plates, PlateBuffs.
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NugRunning

Tracker for DoTs, HoTs, Cooldowns and other auras for all classes.
Config desired spells with trackings.lua
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OmniCC

Addon that adds text to items/spells/abilities that are on cooldown to indicate when they'll be ready for use. OmniCC should be compatible with any addon that uses a cooldown model. Tutorial: tullamods.
Config: /occ or /omnicc
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TellMeWhen

Provides a flexible system of icons for displaying vital information about cooldowns, buffs, debuffs, and reactive abilities... always in a consistent place on your screen. You choose which spells, abilities, items, buffs, and debuffs TellMeWhen shows. The number, size, and position of icons are all customizable. Cooldown icons can be shown when an ability/item is either usable or is unusable. Buff/debuff icons can be shown when the buff/debuff is either present or is absent. Icons can be set to only show in combat.
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tullaCC

Minimal addon for displaying cooldown text on action buttons, inventory items, etc. A lite version of OmniCC.
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