Oxygine

Oxygine is completely free and open source (MIT license) 2D game engine, available on GitHub. It is written in C++ and runs on MacOSX, iOS, Android, Windows and Linux. You can also build and run your C++ Oxygine application in web browsers. It won’t require any plugins, such as Flash, and runs as pure HTML5/JS application using WebGL for rendering. Oxygine is developed to be fast and memory efficient on mobile platforms. It has flexible resources management system, automatic sprites batching, memory pools and more. It provides easy to use API, which is designed with "do more with less code" philosophy. It uses a managed scenegraph system that takes care of rendering and updates, and provides ability to extend with custom rendering and updates. You can analyse your application with embedded tools. Inspect in runtime scenegraph, loaded textures, FPS, performance and more.