Wayland

Wayland is intended as a simpler replacement for X, easier to develop and maintain.

Fluxbox

Fluxbox is a window manager for X that was based on the Blackbox 0.61.1 code.

Gala is a window manager / compositing manager and an integral part of Pantheon, the desktop…

KWin is a window manager for the X Window System, and is in the process of becoming a Wayland…

Ratpoison is a simple window manager with no fat library dependencies, no fancy graphics, no window…

herbstluftwm is a manual tiling window manager for X11 using Xlib and Glib.

pekwm is a window manager that once up on a time was based on the aewm++ window manager, but it has…

Qtile is a full-featured, hackable tiling window manager written in Python.

spectrwm is a small dynamic tiling window manager for X11.