Swm

X Window System window manager

swm (the Solbourne window manager) is an X Window System window manager developed by Tom LaStrange at Solbourne Computer in 1990. The most important innovation of swm was the introduction of the virtual desktop. It also introduced a primitive form of session management (restoring programs in use at the time of shutdown) to X.

References

Thomas E. LaStrange (1990) swm: An X window manager shell. USENIX Summer.
http://users.polytech.unice.fr/~buffa/cours/X11_Motif/motif-faq/part4/faq-doc-1.html

Desktop environments and window managers based on X11 or Wayland

Desktop
environments
(comparison)

GTK-based	Budgie Cinnamon GNOME GPE Java Desktop System LXDE MATE ROX Desktop Sugar XFast Xfce
Qt-based	Deepin DE KDE Plasma Lumina LXQt Razor-qt Trinity UKUI
Motif-based	CDE IRIX Interactive Desktop VUE X.desktop
Other	FVWM-Crystal OpenWindows (OLIT-based) Sakura HyperMedia Desktop (AWT-based) UDE (Xlib/XCB-based) Looking Glass

Shells

GNOME Shell
KDesktop
Moksha Desktop
Phosh
Plasma
- Plasma Bigscreen
- Plasma Mobile
Maynard
Unity

X window
managers
(comparison)

Compositing	Compiz Enlightenment KWin Metacity Metisse Muffin Mutter Project Looking Glass Xfwm
Stacking	4Dwm 9wm AfterStep amiwm Blackbox CTWM cwm Fluxbox FLWM FVWM FVWM95 IceWM JWM Matchbox Motif Window Manager olwm Openbox Qvwm Sawfish swm twm tvtwm vtwm Window Maker WindowLab wm2
Tiling	awesome dwm i3 Ion larswm ratpoison StumpWM wmii xmonad