GLEW
The OpenGL Extension Wrangler Library is a mature open C/C++ library for discovering and loading core and extension functions through one interface.
Why use it
It reduces platform-specific entry-point handling in maintained OpenGL renderers.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
It primarily targets desktop OpenGL; core contexts, EGL, and mobile targets may be better served by other loaders.