Free cross-platform RTS engine providing "Age of Empires"- style game mechanics openage is a free (as in freedom) cross-platform RTS game engine that provides the mechanics of Age of Empires. We use C++20, OpenGL/GLSL, Python, Qt and CMake to allow people using GNU/Linux, BSD, macOS or Windows to play the game natively. Our aim is to make openage a platform for the original Age of Empires games pr