OpenGL

https://www.opengl.org/resources/libraries/glut/glut_downloads.php
About GLUT . . .
GLUT (pronounced like the glut in gluttony) is the OpenGL Utility Toolkit, a window system independent toolkit for writing OpenGL programs. It implements a simple windowing application programming interface (API) for OpenGL. GLUT makes it considerably easier to learn about and explore OpenGL programming. GLUT provides a portable API so you can write a single OpenGL program that works on both Win32 PCs and X11 workstations.
GLUT is designed for constructing small to medium sized OpenGL programs. While GLUT is well-suited to learning OpenGL and developing simple OpenGL applications, GLUT is not a full-featured toolkit so large applications requiring sophisticated user interfaces are better off using native window system toolkits like Motif. GLUT is simple, easy, and small. My intent is to keep GLUT that way.
The GLUT library supports the following functionality:
Multiple windows for OpenGL rendering.
Callback driven event processing.
An `idle' routine and timers.
Utility routines to generate various solid and wire frame objects.
Support for bitmap and stroke fonts.
Miscellaneous window management functions.
The GLUT library has both C, C++ (same as C), FORTRAN, and Ada programming bindings. The GLUT source code distribution is portable to nearly all OpenGL implementations for the X Window System and Windows 95 and NT. GLUT also works well with Brian Paul's Mesa, a freely available implementation of the OpenGL API.
Because GLUT is window system independent (as much as possible), GLUT can be implemented for window systems other than X. Implementations of GLUT for OS/2, NT & Windows 95, and the Mac have ben implemented, but only the Win32 and X11 versions are part of the official GLUT source code distrbution.
The current version of the GLUT API is 3. The current source code distribution is GLUT 3.7.

http://freeglut.sourceforge.net/index.php#download
What?
FreeGLUT is a free-software/open-source alternative to the OpenGL Utility Toolkit (GLUT) library. GLUT was originally written by Mark Kilgard to support the sample programs in the second edition OpenGL 'RedBook'. Since then, GLUT has been used in a wide variety of practical applications because it is simple, widely available and highly portable.

GLUT (and hence FreeGLUT) takes care of all the system-specific chores required for creating windows, initializing OpenGL contexts, and handling input events, to allow for trully portable OpenGL programs.

FreeGLUT is released under the X-Consortium license.

Why?
The original GLUT library seems to have been abandoned with the most recent version (3.7) dating back to August 1998. Its license does not allow anyone to distribute modified library code. This is really unfortunate, since GLUT is getting old and really needs improvement. Also, GLUT's license is incompatible with some software distributions (e.g., XFree86).

下载:
http://www.transmissionzero.co.uk/software/freeglut-devel/

 

http://glew.sourceforge.net/
The OpenGL Extension Wrangler Library
The OpenGL Extension Wrangler Library (GLEW) is a cross-platform open-source C/C++ extension loading library. GLEW provides efficient run-time mechanisms for determining which OpenGL extensions are supported on the target platform. OpenGL core and extension functionality is exposed in a single header file. GLEW has been tested on a variety of operating systems, including Windows, Linux, Mac OS X, FreeBSD, Irix, and Solaris.

ref: http://blog.csdn.net/xuguangsoft/article/details/8002375
http://www.cppblog.com/doing5552/archive/2009/01/08/71532.html