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Full desktop environments

Cinnamon: A variant of GNOME with a more 'traditional' interface
Elementary: Elementary OS
Enlightenment
GNOME
GNUstep: The GNU OpenStep Implementation
KDE
LxDE: provide a new desktop environment which is lightweight and fast
Unity: A desktop environment built on GNOME
Xfce: Lightweight GTK+-based environment

Light desktop environments

awesome: Highly configurable, next generation framework window manager
fluxbox: Lightweight WM with support for tabs
FVWM: An extremely customizable window manager and some desktop applications
IceWM: Window manager designed to be small, fast and lightweight
WindowMaker: Window manager intended to work with GNUstep

出典　freedesktop.org/wiki/Desktops/