Some underappreciated and forgotten tiling wms that are still viable today:

- ratpoison ("tmux for X11". Ultralight, great for kiosks and similar where you barely want a WM at all)

- stumpwm (ratpoison on steroids in Lisp)

- Xmonad (A bit different tiling dynamic that some prefer. I dig it despite Haskell, not because of it)

- Qtile (Very flexible and easily hackable in python yet reasonably stable and fast. You can reproduce for example the Xmonad or i3 experiences pretty easily)

And the one I use and love: DWM.

(which I use on top of Pop!_OS, oddly enough).