GNOME – An easy and elegant way to use your computer, GNOME 3 is designed to put you in control and get things done.
KDE is an open community of friendly people who want to create a world in which everyone has control over their digital life and enjoys freedom and privacy.
Xfce is a lightweight desktop environment for UNIX-like operating systems. It aims to be fast and low on system resources, while still being visually appealing and user friendly.
Enlightenment – Desktop Environment.
LXDE – Desktop environment for all.
Trinity – Desktop Environment.
MATE – Desktop Environment.