Flax Engine is described as 'Is claimed the most agile game engine. It's open source, cross-platform and it lets you write scripts in C++ and C# seamlessly. Also focused on lightweight development. A true game changer' and is a game development tool in the development category. There are more than 100 alternatives to Flax Engine for a variety of platforms, including Windows, Mac, Linux, Web-based and iPhone apps. The best Flax Engine alternative is Godot Engine, which is both free and Open Source. Other great apps like Flax Engine are Unity, Unreal Engine, GDevelop and Wick Editor.