Mac OS is a series of graphical user interface-based operating systems developed by Apple Inc. for their Macintosh line of computer systems. Mac OS is credited with popularizing the graphical user interface. The original form of what Apple now calls OS X was the integral and unnamed system software first introduced in 1984 with the original Macintosh, and referred to simply as the System software.

Game development on Mac OS relies mainly on an OpenGL based graphics, either directly or using OpenGL based libraries or frameworks.

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