The is a foundational tool for modern graphics programming. It simplifies the process of managing OpenGL extensions by providing a cross-platform C/C++ loading mechanism. Because standard operating system headers (especially on Windows) often only support very old versions of OpenGL, developers use GLEW to access newer features and functions provided by modern graphics card drivers. Where to Download GLEW
The safest way to get GLEW is through its official distribution channels to ensure you have the latest stable release (currently version 2.3.1).
The primary hub for documentation and source code is GLEW on SourceForge.