What is the X Server equivalent on OSX? What is the X Server equivalent on OSX? I am not looking for XQuartz. What component of the OSX is responsible for rendering graphics? Just as X11 does for *nix.
What I was looking for turns out to be the display server called The Quartz Compositor that along with Quartz 2D forms the Core Graphics framework of the OSX.

X Quartz seems to be the interface that routes requests from applications that use the X11 framework to the Quartz Compositor.