No DE. Currently on DWL, but I’ve used Hyprland, River, Sway, Qtile, SperctWM, BSPWM, XMonad and Awesome (from most recently configured, to the first one I ever used) . I have used both GNOME and KDE at times where I didn’t have anything else on the system yet, I’ve used Cinnamon full time in the beginning, and I use a lot of XFCE apps as a part of my setup, notable examples being Thunar and Ristretto (and I used to use xfce4-screenshooter).