GLFW is an Open Source, multi-platform library for creating windows with OpenGL contexts and receiving input and events. It is easy to integrate into existing applications and does not lay claim to the main loop.
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Setting up latest versions of OpenGL is so easy now!
Probably the best API I've seen. They should teach this API in classrooms.
GLFW Is a great library and is very easy to use. They do their best to offer you the features that are suggested the most as well as keeping the library up to date and working good. I am currently using this library in my 2d game engine i am developing. I just hope they add in OpenAL support or at least the ability to make using OpenAL easier.