VTWM

A virtual window manager for the X Window System. It is based on twm, and can be used just like twm. It provides multiple virtual screens, a 3D look, ...

VTWM manual page

VTWM(1) VTWM(1) NAME vtwm - Virtual Desktop Tab Window Manager for the X Window System SYNTAX vtwm [ -display dpy ] [ -s ] [ -f initfile ] [ -v ...