3D Graphics - OpenGL

Reference

URL Description
OpenGL 4 Reference Pages
OpenGL 4.4 API Reference Card
OpenGL Code Resources This is a bit dated.
OpenGL Software Development Kit (SDK)

Welcome to the OpenGL SDK! Here you'll find some of the most valuable resources available to OpenGL developers, all in one place. Use the menu above to navigate to each contribution. Revisit often, as there will be new contributions coming online all the time!

This is not a traditional SDK in the sense that it doesn't arrive on CD-ROM, and it isn't one monolithic download. Instead, it is a gathering of 3rd party contributions from many of the leaders in the community. In some cases the information and downloads are available directly from the SDK on opengl.org. In other cases, you'll find links to the original materials elsewhere on the web. In all cases, the contributions have been hand selected and represent the best of what's out there.

The OpenGL SDK is not downloadable as a single image. Individual projects hosted on the SDK website can be downloaded from their project pages

The OpenGL SuperBible