This add-on is much like DoTTimer, but instead of showing a countdown of buffs; it shows a countdown to the next available time a boss can use its spells.

Frequent updates of this add-on will rely heavily on the community to collect and give me data on bosses not listed.

Bars are now color coded;

• Purple is Spawn Cooldowns.
  
• Orange is Attack-related Cooldowns.
  
• Red is Buffs/Debuffs. (Click to target bar.)
  
• Cyan is Buff-related Cooldowns.
  
• Green is Health % Based.
  
• Blue is Mana/Energy % Based.

Bosses currently displayed;
Castle Blight -

• Lord Fetidflesh
  
• Adrian Valir
  
• Ghost of the White Knight
  
• Mor'Ghuun

Gorluxor's Tower -

• Nogrom
  
• Ghostly Great Dragon
  
• War'kaz the Mindreaver
  
• Zalmar the Twisted
  
• Strina the Fierce

Laguna Boil -

• Semer Karpol
  
• Manuel
  
• Izot the Unyielding
  
• Victor Korleone

Heart of Tensess Temple -

• Vissarion Arhivin
  
• Voisvet Belov
  
• Loyal Worshipper
  
• Hurken the Controller
  
• Nomarkh Khatire
  
• Gorluxor
  
• Shazalon the Greater

Astral Confrontation -

• Defenders' Great Mage

Bloodclaw -

• Velav the Deceptive
  
• Withersnarl
  
• Nidene

Zavert Isle -

• Saldoch
  
• Siloda the Frosty

Lab 9 -

• General Novikov
  
• Yasskul Setnakhte

Twilight Isle -

• Andrey Zlobin

XAES -

• Ugy the Dull
  
• Igy the Dim
  
• Grym the Gloomy
  
• Eyepopping Family
  
• Alexey Skifin
  
• Afanasy Kudenov
  
• Nomarkh Khay

Isle of the Lost -

• Pulsating Magic Elemental
  
• Kazad

June Catacombs -

• Aurakh

Lab 13 -

• Bang the Bloodthirsty
  
• Sarbaz Menkare
  
• Igor Smazhin
  
• Stepmother
  
• Stas Yinov
  
• Skulnar the Fierce
  
• Astral Executioner

Isle of the Damned -

• Lakazam the Envious
  
• Arachnax
  
• Ivan Neladov
  
• Maria Neladova

Oreshek Fortress (Astral) -

• Runaway Troll
  
• Roman Vihrov
  
• Yefim Lyuty
  
• Gudimir Belsky

Hikut Isle -

• Darksoul Captain
  
• Mazar the Insidious

Jade Labyrinth -

• Pirkaz the Cryptic
  
• Mazist the Protective
  
• Shashik the Impure

Glitterlake Isle -

• Waterfolk Devotee
  
• Ah'sakat

Genoer the Devourer

Tensess Temple (Empire) -

• Rama the Cruel
  
• High Priestess Ahaneith

Goblin Republic -

• Goblin Overseer
  
• Urub the Enlightened

Silent Isle -

• Razortooth
  
• Ilya Obolensky
  
• Dalera

Darkblood Citadel -

• Rakshana
  
• Carlos de Doucer
  
• Twilight Shadow
  
• Armando de Doucer

Defiled Ruins -

• Olivier de Doucer
  
• Actpaz the Invader
  
• Vur'tazz the Ravager

Fireheart Isle -

• Shadaz the Supreme
  
• Hephaesto

Isle of Corruption -

• Viletide
  
• Stompz
  
• Shadowstomp

Webwarden Pass -

• Black Widow
  
• Zlobinya Yadov
  
• Evsey Volkov
  
• Black Venom

White Mountain -

• Bonesaw
  
• Potbelly
  
• Kazhetan
  
• I'do-ol

The Dark Carnival -

• Arakam
• Calefaction
• Bejewelled Harlequin
• Red Beard

Solitary Fortress -

• Yasskul Flach
• Negus Minhotep
• Negus Haifa
• Negus Zirach

Koch-Itzmahl -

• Cayman
• Leono
• Blood Berry
• Seven-fingered Shiskh

World Bosses -

• Rotfist
  
• Grimgrin
  
• Zukan the Desecrator
  
• Shur'lon
  
• Porqun
  
• Soulpiercer
  
• Kurzurgar the Traitor
  
• Yaver Khaba
  
• Dahinda
  
• Bozak the Bloodthirsty
  
• Andrey Chikatilin
  
• Rocktooth

You can move the container using the slash command /btdnd and then drag the container.

If you want to assist in collecting new boss data use the slash command /bttrack each time you log-in or change "local TRACK = false" to "local TRACK = true" in the BossTracker.lua. Then go about fighting the bosses you want to add, the data for the attacks of the boss are printed to the mods.txt when it either dies or you leave combat with it. Give me a copy of the data and I'll try and figure out the timers for that boss.

Thanks to Phal for "asking" for this add-on and Gruman, Pubescent, Mrjackal, and the_mexican_guy for their assistance in data collection.

Version 1.6:

• Added Rocktooth, Miner, and five of the new Astral Allods. Again fixed buff stack tracking.

Version 1.5:

• Added a few more bosses (Strina the Fierce, Zalmar the Twisted).
  Fixed buff stack tracking.

Version 1.4:

• Added non-heroic XAES, Fireheart Isle, and Isle of Corruption.
  Adjusted some bosses to meet current standards.
  Removed Seismic Attack from Nogrom's player debuff (red) display as their were complaints about it being spammy.
  Fixed the add-on to work with 2.0.06 buff changes.

Version 1.3:

• Added TT1Empire, Goblin Republic, Silent Isle, Darkblood Citadel, and Defiled Ruins.
  Added a new mechanic that tracks health/mana percentages for collecting data on health/mana percentage based attacks.
  Added a new mechanic that displays the target of a boss' buff/debuff and the remaining time or stacks for that buff/debuff. This bar is clickable for easy healer targetting.
  Added color coding.

Version 1.2:

• Added Glitterlake, Hikut, Jade Labyrinth, Oreshek, and some World Bosses.
  Added War'kaz and updated some other values.
  Added a new mechanic that tracks boss created buff/debuff stacks and implemented the spawn tracking.

Version 1.1:

• Added Genoer the Devourer, Stas Yinov, Skulnar the Fierce, Astral Executioner, Arachnax (incomplete), and Maria Neladova (incomplete). Fixed Siloda the Frosty (had it as Siloda the Frost) and fixed Nomarkh Khatire (had it as Nomark Khatire).