There's too many of them to list , probably 50 of them. If you care about the UI its Bartender for custom bars, Quartz for castbar, Details for dps recounts, Questie for quest overhaul, weakaura for custom bars and aura tracking, MinimapButtonButton to remove addon clutter near minimap, and Bagnon for bags. Those are only a few of them.
And thats why am quiting, femyst tbc new server due, keep cheating in checj and banning addons which will be good i think as itll add a challenge to the game and seperate the good from the bad