Open 3D Engine is described as '(O3DE) is an Apache 2.0-licensed multi-platform 3D engine that enables developers and content creators to build AAA games, cinema-quality 3D worlds, and high-fidelity simulations without any fees or commercial obligations' and is a game development tool in the development category. There are more than 100 alternatives to Open 3D Engine for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best Open 3D Engine alternative is Godot Engine, which is both free and Open Source. Other great apps like Open 3D Engine are Unity, Unreal Engine, GDevelop and Candlestick.
AresEd is a high-level and fully featured 3D game creation suite. It is Free and Open Source. When it is finished you will be able to make full 3D games without writing any code (although a fallback to the python scripting language will be provided).
Monkey is a modular language. You can create your own custom modules and use other people's - including the awesome box2d and minib3d modules!.
GameCraft (formerly Robocraft X) is a game maker where you can build your own physics games from blocks and components without the need to write code. You can also play many games that have been created and shared by others in the community.
Cave Engine is a Simple, easy to use, 3D desktop Game Engine that is scriptable in Python.
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