CodeGuru
- Tutorials and source for Visual C++, MFC and OpenGL.
- http://www.codeguru.com/Cpp/G-M/opengl/

ATI Developer
- SDK's, DDK's, sample code, early driver releases and testing for ATI hardware.
- http://ati.amd.com/developer/

OpenGL CSG Rendering
- Multi-pass algorithms for rendering volumetric intersection, difference and union.
- http://www.nigels.com/research/

OpenGL Toolkit FAQ
- Information about various OpenGL toolkits including GLUT, SDL, CPW and others.
- http://www.mathies.com/glfaq/GLToolkitFAQ.html

OpenGL
- Frequently Asked Questions.
- ftp://rtfm.mit.edu/pub/usenet/news.answers/graphics/opengl-faq/

Nomad Programming
- OpenGL Math and Win32 Tutorials, Demos, Links, Projects.
- http://developer.nomadph.com/

Sulaco
- Delphi, OpenGL, game development and graphics site. It currently have over 160 tutorials online.
- http://www.sulaco.co.za/

Gamasutra
- Feature game development articles: programming, art, production.
- http://www.gamasutra.com/php-bin/article_display.php

flipCode.com
- Graphics and game programming tutorials.
- http://www.flipcode.com/tutorials/

Exaflop!
- The Programmers Resource. Graphics and games programming documentation.
- http://www.exaflop.org/

GameDev.net
- OpenGL articles, tutorials, books and source Code.
- http://www.gamedev.net/reference/list.asp?categoryid=31

NVIDIA
- Developer information including SDK, Cg resources and drivers.
- http://developer.nvidia.com/

Michael Gold's OpenGL Page
- Source code, links, OpenGL tutorials and a port of the SGI flight simulator to Win32.
- http://www.berkelium.com/OpenGL/

SDL OpenGL Tutorials
- Documentation, tutorials, and code for OpenGL with the SDL Library.
- http://www.libsdl.org/opengl/index.php

Advanced OpenGL Game Development
- Advanced OpenGL techniques from the Game Developer Conference 1999.
- http://www.berkelium.com/OpenGL/GDC99/index.html

Shadow Casting Effects
- A technique for shadow mapping using a depth buffer from the light's point of view.
- http://www.r3.nu/~cass/shadowsandstuff/