Godot Engine - Feature-packed 2D and 3D open source game engine.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
HaxeFlixel - Create cross-platform games easier and free. All with one codebase.
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.
LibGDX - Libgdx is a Java game development framework that provides a unified API that works across all...
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.