GLUT (pronounced like the glut in gluttony) is the OpenGL Utility Toolkit, available for C, C++, FORTRAN, and Ada. GLUT is a window system independent toolkit for OpenGL that implements a simple windowing API. Because of its ease of use, it is often used to learn how to write programs with OpenGL. Since it is closed source, some people have gone on to create newer, open source alternatives (two examples of this are Freeglut, and GLFW).

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