X11 is described as 'The X.Org project provides an open source implementation of the X Window System. The development work is being done in conjunction with the freedesktop.org community. The X.Org Foundation is the educational non-profit corporation whose Board serves this effort, and whose Members' and is a desktop environment in the os & utilities category. There are four alternatives to X11 for Linux and Mac. The best X11 alternative is Wayland, which is both free and Open Source. Other great apps like X11 are Compiz, XQuartz and Mir.
Wayland is a project to define a protocol for a compositor to talk to its clients as well as a library implementation of the protocol.
Almost everyone thinks Wayland is a great X11 alternative.
Wayland is the most popular Linux alternative to X11.
Wayland is the most popular Open Source & free alternative to X11.
Compiz is a compositing manager adding fancy effects to your windows, from drop shadows to awesome desktop effects like the Desktop Cube or the Expo view.
This provides a windowing system for some applications that normally run on Linux, as well as for forwarding GUI from the server to your client computer.
XQuartz is the most popular Mac alternative to X11.
The purpose of Mir is to enable the development of user interfaces shells. In the case of Ubuntu, Mir will be utilized by next generation Unity. In addition, Mir will be developed in a manner that will retain its flexibility and usability in order that shells other than Unity...
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