What are some alternatives?
When comparing MonoGame and Orx, you can also consider the following products
RPG Maker - Make your own PC game with RPG Maker. Our easy to use tools are simple enough for a child, and powerful enough for a developer. Try it free today!
Corona SDK - Cross-platform mobile app development.
AppGameKit - AppGameKit is a game development platform for mobile devices.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Construct 2 - Scirra Construct is a 2D game development engine with a focus on building games visually.