XScreenSavera collection of free screen savers for X11, macOS, iOS and Android by Jamie Zawinski and many others. XScreenSaver is the standard screen saver collection shipped on most Linux and Unix systems running the X11 Window System, since its first release in 1992. On X11 systems, XScreenSaver is two things: it is both a large collection of screen savers; and it is also the framework for blanking and lock
