PWM is a lightweight x window manager that can have multiple client windows attached to a single frame, that can be switched between via tabbing.
The author of PWM, Tuomo Valkonen, has ceased development on PWM and now works on PWM’s successor: Ion.
Although PWM is now no longer being actively developed, PWM’s tabbed windowing feature has been extremely influential and many other window managers have copied it.
pwm
wm
window
lua
window-manager
License:Artistic-License
Tuomo-Valkonen