WADE - The easiest 2D and isometric HTML5 engine to make amazing web games and apps. Free and open source.
JavaScript - Lightweight, interpreted, object-oriented language with first-class functions
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.
CKEditor - Real-time collaborative future-ready rich text editor
Allegro - Allegro 4 and Allegro 5 are cross-platform, libraries mainly aimed at video game and multimedia...
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.