ENIGMA – LateralGM - LateralGM is a powerful IDE for ENIGMA, and both of these combine to offer you a cross-platform game environment.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Adventure Game Studio - Adventure Game Studio provides the tools to make your own adventure, for free!
Lobster - Lobster is a game programming language.
Cocos Creator - Cocos Creator is more than a efficient, lightweight, free, open-source, cross-platform graphics engine: it's also a platform to create 3D content in real time.
G3D Innovation Engine - The G3D Innovation Engine is a commercial-grade C++ 3D engine available as Open Source (BSD...