What are some alternatives?
When comparing PlayN and Platinum Arts Sandbox, you can also consider the following products
Unity - The multiplatform game creation tools for everyone.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Pygame - Pygame is a set of Python modules designed for writing games.
RenPy - Ren'Py is a free and cross-platform visual novel engine that helps you use words, pictures, and...
Castle Game Engine - An open-source 3D/2D game engine for ObjectPascal.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.