E17 short for Enlightenment 0.17 has been officially released after a whooping 12 years of development. E17 is a light weight Window manager / Desktop that runs on Linux/Unixes. It has been developed from the grounds up which includes its own libraries. The libraries behind Enlightenment are collectively referred to as EFL (Enlightenment Foundation Libraries), each with a specific name and purpose. The window manager is a lean, fast, modular and very extensible window manager for X11 and Linux.