Window Maker
From ArchWiki
Window Maker is a window manager (WM) for the X Window System. It is designed to emulate NeXT's GUI as an OpenStep-compatible environment and is characterized by low memory demands and high flexibility. As one of the lighter WMs it is well-suited for machines with modest performance specifications.
Installation and configuration
To install Window Maker:
pacman -S windowmaker
Once installed create or edit the file $HOME/.xinitrc as follows:
exec wmaker
To start Window Maker:
startx