Atomic Game Engine is an open-source 2D and 3D game engine using C++, C#, JavaScript, and TypeScript. It supports rendering, physics, and UI, ideal for cross-platform games. Atomic targets Windows, macOS, Linux, Android, iOS, and HTML5, with a visual editor for productivity. Its MIT license ensures no royalties, and the community provides documentation, though less active since 2016. Atomic’s multi-language support appeals to diverse developers, but it’s less polished than Godot. Suitable for indie projects like RPGs or simulations, it offers flexibility but requires familiarity with its API. Perfect for developers seeking a lightweight engine with broad platform support.