I use IceWM. I use RXVT Unicode and Tmux to tile stuff.
IceWM is a good and simple stacking/floating window manager. It comes with a bar and a clock. And IceWM doesn't use XML config files (unlike OpenBox). If you want a tiling WM, I recommend AwesomeWM (I think Awesome can also be configured to be stacking WM) or Ratpoison/StumpWM. i3, i3-gaps and Sway (wayland) are also popular options. If you are looking for a stacking wayland compositor, take a look at Labwc.