Godot Engine - Feature-packed 2D and 3D open source game engine.
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.
Orx - Orx - a portable open source game engine
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!
LibGDX - Libgdx is a Java game development framework that provides a unified API that works across all...