Atomic Game Engine Alternatives

Godot Engine is a feature-packed, cross-platform game engine to create 2D and 3D games from a unified interface. It provides a comprehensive set of common tools, so that users can focus on making games without having to reinvent the wheel.

Unreal Engine is a professional suite of tools and technologies used for building high-quality games across a range of platforms. Unreal Engine’s rendering architecture enables developers to achieve stunning visuals and also scale elegantly to lower-end systems.

The Wick Editor is a free and open-source tool for creating games, animations, and everything in-between. It's designed to be the most accessible tool for creating multimedia projects on the web. Your creations can run on any device with a web browser - that means mobile too.

Urho3D is a lightweight, cross-platform rendering and game engine implemented in C++ and released under the MIT license. Greatly inspired by OGRE and Horde3D.

Cocos Creator is a complete package of game development tools and workflow, including a game engine (based on Cocos2d-x), resource management, scene editing, game preview, debug and publish one project to multiple platforms.

ct.js is a 2D game editor (desktop app) based on web technologies. It aims to be an extensible yet simple game-making tool, accessible for both newbies and experienced game developers.

A refreshingly simple data-driven game engine built in Rust. Free and Open Source Forever!

microStudio is a free game engine online. Create games, learn programming, play, share, prototype and jam!.

GeeXLab is a free standalone application for desktop operating systems. Just download it and use it. GeeXLab is available for Windows 32/64-bit, Linux 64-bit, Mac OS X and Raspberry Pi.

Making games as the '80s arcade games. Includes Run'n'Gun, vertical & horizontal Shooters or Platform, makes games as Pac-Man, Commando, 1942, Ghosts 'n' Goblins or Gauntlet, with sprite sheets, pixel art, sound fx, & music. You get arcade feel.