Linux/Types of GUI

Here is a list of Graphical User Interfaces (GUI) common in Linux

Desktop Environments

 * XfcE
 * GNOME
 * KDE
 * LXDE

Window Managers

 * FVWM
 * Enlightenment
 * Openbox
 * Fluxbox

Display server communications protocols

 * X11
 * Wayland