The best replacement for xorg is xfree86.

The best alternatives to xorg are rated as following:
★★★★★  xfree86
★★★  xvesa
★★★  wayland
★★★  x11
★★  xfree
★★  xsun
★★  fglrx
★  xserver
★  xgl
  xmir

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Google Trends

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xorg
xfree86
xvesa