Taryble
I see the following addons:
Buff/debuff display - Elkano's Buff Bars
actionbars - Dominos or Bartender, they're impossible to tell apart without seeing the config screen.
unitframes - Pitbull4
dot timers - Forte Xorcist
cooldown bar - Forte Xorcist
threatmeter - Omen
damagemeter - Recount
panel addon - kgPanels
raid frames - Grid
hud frames - ArcHUD
combat text - MSBT (because of use of the MSBT Porkys font)
boss addon - Deadly Boss Mods
I can't tell if that bar on the left is a GCD timer or Swing timer - but it looks like it's from either Quartz or AzCastBar.