Edit: With Visual Studio 2015 Community edition, you won’t really need those files. Check out OpenGL in Visual Studio 2015 to see how easy it is to work with OpenGL without having to deal with managing all these files (thanks to Nuget). I also have the files below more organized on GitHub.
Looking for the lib, header, or dll files for OpenGL, GLUT, GLAUX or GLUI on Windows? I have collected them from different sources so they can be easily downloaded as a single package: http://cid-e38f9fc6490b29d9.skydrive.live.com/self.aspx/Public/GL%20Files.zip. It contains the following content:
Disclaimer: I have not created or modified any of those files, nor do I claim any ownership of them. They were simply collected from different sources and redistributed.