9e2d0a54_Linux_Desktops_Window_Managers__Design_Goals
[Desktop/Window Manager] XFCE [Description] Lightweight desktop environment [Based On] Usually uses XFWM4, but works well with other window managers [Advantages] Somewhat lower system requirements than GNOME or KDE [Disadvantages] Possibly a bit too resource-hungry for low-end systems [Design Goals] 
Full-featured desktop environment, but light on resources
PLABO: A Sampling of Linux Desktops/Window Managers
Design Goals