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!
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
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.
Unity - The multiplatform game creation tools for everyone.
Stride Game Engine - Stride is an open-source 3D Game Engine written in C# and released under the MIT License that allows you to build powerful game worlds for free or to generate income.