@bkuhn
Awesomewm does that. Config file is Lua, and while it can do tiling (and is often used that way by most users) it doesn't require it, and indeed the default is not tiling.
@aa4hs

@bkuhn
I tried the 'four displays' setup when last I was at my work's headquarters. Each desk there has two monitors connected to a USB-C docking station; I added my own USB-C portable monitor, and obviously also the laptop's built-in.

3 is useful. One where you work, one with the result of your work, one where you have reference material.

I had no real use for the fourth. I tried my mail and chat clients there, but that just didn't work for me.
@hko

@bkuhn
I felt that I couldn't pay attention to more than three displays. Even though the displays were arranged optimally (the desk's 2 on stands side by side, the laptop and portable one below those), it quickly became impossible for my brain to care about the fourth display. I'd often look from the laptop to the portable monitor and back, occasionally to top left, but top right just kept being ignored, even though lots was happening there.

YMMV, of course.
@hko