OpenGL is a portable, cross-platform software library, often used as an interface to graphics hardware. OpenGL depends on the use of a native windowing system for display. OpenGL can be used to create 2D and 3D graphics, as well as general matrix math processing. OpenGL supports programming techniques such as 3D modeling, lighting, affine transforations, alpha blending, texture mapping, and fog.
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A record of OpenGL extensions, along with information about using OpenGL extensions and creating new OpenGL extensions
The official site for OpenGL information.
Guides, reference resource and a forum for beginning OpenGL developers.
SGI OpenGL Website
OpenGL information from the creators of OpenGL.
Comprehensive overview of OpenGL, including history, pipeline architecture, language bindings and sample code.