Xfce

Xfce (pronounced as four individual letters, ) is a free and open-sourcedesktop environment for Linux and other Unix-like operating systems.

Xfce aims to be fast and lightweight while still visually appealing and easy to use. The desktop environment is designed to embody the traditional Unix philosophy of modularity and re-usability, as well as adherence to standards; specifically, those defined at freedesktop.org.