Buff Addons

Aura Frames

Aura Frames allows you to display any kind of buff or debuff on any given unit with highly customizable filtering and ordering functionality. It also includes information about internal cooldowns, spell cooldowns, totems and weapon enchantments. Supports two ways of displaying aura's: Button style or bar style. Features: Buffs and Debuffs on any unit (your self, target, pet etc); Weapon enchantments; Spell cooldowns; Spell cooldowns for your pet; Mouse over; Test unit; Totems.
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BasicBuffs

Allows you to move the default Blizzard buff frame. Commands: /bb or /basicbuffs
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nBuff

Simple buff mod from NeavUI. Restyles buffs & debuffs.
Requires !Beautycase for borders.
Vranx Note: The screenshot shows a modified border image, the normal Beautycase border is lighter.
wowi

PhanxBuffs

PhanxBuffs is a basic replacement for the default UI's buff, debuff, and temporary enchant (weapon buff) frames. It looks and acts basically like the default buff frames, with a few improvements: Buff and debuff icons are sorted by their remaining duration, Text timers are shown only when less than 30 seconds remain on the buff or debuff, Weapon buff icons can show the spell or item that buffed your weapon, instead of the weapon itself, Buff tooltips show the name of the party or raid member who cast the buff on you, Buffs or debuffs you never want to see can be hidden (eg. Chill of the Throne), Basic configuration options are available.
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Timers

ButtonTimers

ButtonTimers is action buttons with timers attached. The timers can be configured to show a buff/debuff or the cooldown of a spell. The timers are highly configurable, with lots of options to play with.
Config: /buttontimers config
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ClassTimer

Creates timer bars or icons for buffs and debuffs for player, target and focus. All three bars can be moved seperately. To track CC Effects you must set the CCed mob as your focus if its not your target.
Config: /classtimer
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Ellipsis (Multi-Target DoT Timers)

Ellipsis is an addon that features multi-target aura tracking for spells that you (and your pet) cast on others. Additionally it keeps track of your pets spells when cast on others, tracks ground-targeted AoEs, temporary minion summons and totems. Cooldowns for your items, pet abilities and your own abilities can also be tracked. Options can be accessed by typing either /ellipsis or /...
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Buff/DeBuff/Proc Trackers

AdiButtonAuras

AdiButtonAuras allows you to track buffs and debuffs (also known as "auras") by overlaying the relevant information on top of your actionbar buttons. Introduction page.
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Cork

Cork is a reminder addon, aimed primarily at buffs.
Reminders for: self-only buffs, auras and shapeshifts; raid-group buffs cast on multiple targets; warrior shouts while in combat; missing Talent Points; missing Glyphs; available Trainer Spells; missing Food Buffs; unselected Minimap Tracking; Repairing while in town; opening Clams; Combinable items. Class Reminders for: Priest Fear Ward, Shaman Earth Shield, Warlock Demons/Soul Link/Missing Soulstones & Healthstones. Includes a Macro-generating button like Buffet's.
github

Decursive

This is a cleaning mod. Its job is to help a class that can remove afflictions to do it with ease in every condition (playing solo, in small groups or in big raids).
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GoodNewsEveryone

GoodNewsEveryone! is a "reactive ability" alert addon. It will display proc buffs the player should know about for decision making, and abilities that are only available under certain conditions. GNE! is inspired by OhSnap's design and MSBT's triggers.
github

NeedToKnow

Allows you to monitor specific buffs and debuffs of your choosing as timer bars that always appear in a consistent place on your screen in a consistent color. It's especially useful for monitoring frequently used short-duration buffs and debuffs. For example, a rogue could configure NeedToKnow to show timer bars for Slice and Dice, Rupture, and their own stack of Deadly Poison VII. NeedToKnow also works with procs and on-use trinkets. The number, size, position, and color of timer bars are all customizable.
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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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Power Auras Classic

Gives players better visibility when you gain buffs, debuffs, etc.... You can see the graphic I set up in the screenshot, it will show when I dont have Battle Shout active and it will only show when I am in combat.
Config: /powa
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Raven

Customizable timer bar and icon configurations to monitor buffs, debuffs and cooldowns. Comprehensive condition checking to support buffing/debuffing, spell rotations, etc. Highlights for active spells plus cooldown counters on Bartender4, Dominos and Macaroon buttons. Preset spell colors and cooldowns plus buff-related conditions for each class.
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rFilter3

Lets you track/filter buffs, debuffs and cooldowns. This mod requires Lua code editing to set up the spells to track and their location on the screen.
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sFilter

Minimalistic proc/buff/debuff watcher with premade spell lists for each class, alternative to PowerAuras or WeakAuras. No ingame configuration, all settings is in settings.lua, use notepad for edit, all necessary comments are added in header, good luck. This mod supports only icons and don't have internal cooldown counter, so you have to use any other CC watchers like tullaCC. For ElvUI users, now supporting internal cooldown counter, like on action buttons.
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StupidBuffs2

Removes holiday style (and other custom) buffs automatically when not in combat including the Jack-O-Lantern.
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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. Video: YouTube
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WeakAuras 2

WeakAuras is a powerful and flexible framework that allows you to display highly customizable graphics on your screen to indicate buffs, debuffs, and a whole host of similar types of information. It was originally meant to be a lightweight replacement for Power Auras, but it now incorporates many features that Power Auras does not, while still remaining more efficient and easy to use. Tutorials; WoW Insider, YouTube, Vox Immortalis.
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