Godot Engine - Feature-packed 2D and 3D open source game engine.
HaxeFlixel - Create cross-platform games easier and free. All with one codebase.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Orx - Orx - a portable open source game engine
Unity - The multiplatform game creation tools for everyone.
LibGDX - Libgdx is a Java game development framework that provides a unified API that works across all...