Apple's OpenGL Resource - http://developer.apple.com/graphicsimaging/opengl/ Developers tools and documentation for using OpenGL on Apple systems. Includes a list of OpenGL extensions supported by Apple, how OpenGL fits in their architectures, and performance tips.
SGI OpenGL Website - http://www.sgi.com/products/software/opengl/ OpenGL information from the creators of OpenGL.
OpenGL Extension Registry - http://oss.sgi.com/projects/ogl-sample/registry/ A record of OpenGL extensions, along with information about using OpenGL extensions and creating new OpenGL extensions
OpenGL Hardware Registry - http://www.delphi3d.net/hardware/allexts.php A registry of all graphics cards and what OpenGL extensions they support.
OpenGL.org - http://www.opengl.org/ The official site for OpenGL information.
NVIDIA Developer Zone: OpenGL - http://developer.nvidia.com/page/opengl.html OpenGL related software, tools and documentation for developers.
Wikipedia: OpenGL - http://en.wikipedia.org/wiki/Opengl Comprehensive overview of OpenGL, including history, pipeline architecture, language bindings and sample code.
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