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Run X Windows X11 on your Android smartphone
The X Window System, also known as X or X11, is a computer software system and network protocol that provides a GUI for networked computers. In order to get this running on your Android device, you need to already have a Debian shell on the phone. You will also need a copy of Andoird VNC viewer or a similar VNC client in order to avoid needing a custom display driver.
Although slightly technical and clearly for the linux enthusiasts, it is still kinda cool. If you want to know more head on over here to find out all the relevant information.