Pretty much the standard tools that most people have open all the time I guess. I just want to see them all all the time without having to constantly switch windows or hide the thing I'm working on.

Music, messenger, Discord, Slack, 2 or 3 instances of my IDE, source control UI, a terminal or three, documentation for the thing I'm working on, notepad++

Dude. If you get the third row PLEASE take another picture and share it.

Your set up is magnificent.