Almost every skinnable WM has a BeOS theme. Pekwm has my favourite BeOS theme (https://www.pekwm.se/themes/benu.html https://www.pekwm.se/themes/benu.html) bec

Almost every skinnable WM has a BeOS theme. Pekwm has my favourite BeOS theme (https://www.pekwm.se/themes/benu.html https://www.pekwm.se/themes/benu.html) because it supports window grouping flawlessly, which turns every window into a potential tab just by dragging.