Unity - The multiplatform game creation tools for everyone.
JavaScript - Lightweight, interpreted, object-oriented language with first-class functions
Wick Editor - The Internet's free and open-source creation toolkit.
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.
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Allegro - Allegro 4 and Allegro 5 are cross-platform, libraries mainly aimed at video game and multimedia...