Enlightenment is a completely themeable, highly configurable WindowManager for the X Window System, traditionally used in Unix environments. It is currently up to release 0.16-ish, commonly refered to as E16, while a mayor rewrite is underway (and has been underway for years) for Enlightenment 0.17 (E17) which is planned to become a full desktop environment.
Part of CategoryWindowManager
2 pages link to Enlightenment:
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