Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.

SFML - SFML provides a simple interface to the various components of your PC, to ease the development of games and multimedia applications. It is composed of five modules: system, window, graphics, audio and network.

FLTK - Fast Light Toolkit - Fast Light Toolkit (FLTK)

SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...

wxWidgets - wxWidgets: Cross-Platform GUI Library

raylib - Cross-platform, open-source game development library in C.