wxWidgets - wxWidgets: Cross-Platform GUI Library
SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
Vulkan - Vulkan is a new generation graphics and compute API that provides high-efficiency, cross-platform access to modern GPUs used in a wide variety of devices from PCs and consoles to mobile phones and embedded platforms.
Electron - Build cross platform desktop apps with web technologies
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.