Flax Engine 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.




UPBGE is described as 'A extremely powerful application to make games in python as well as in visual programming' and is a game development tool in the development category. There are more than 100 alternatives to UPBGE for a variety of platforms, including Windows, Linux, Mac, iPhone and Android apps. The best UPBGE alternative is Godot Engine, which is both free and Open Source. Other great apps like UPBGE are Unity, Unreal Engine, GDevelop and Defold Engine.
Flax Engine 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.




Pygame is a set of Python modules designed for writing video games. Pygame adds functionality on top of the excellent SDL library. This allows you to create fully featured games and multimedia programs in the python language.

A free software game engine focusing on developing games faster, more modular and stable with true -1 day portability support.
![Drag[en]gine screenshot 1](https://d4.alternativeto.net/HvCzlUP6BwLK4uM_arI1JS0N5-jUXRUYoHrzYhksZGM/rs:fill:309:197:1/g:no:0:0/YWJzOi8vZGlzdC9zL2RyYWctZW4tZ2luZV83ODY2NjZfZnVsbC53ZWJw.jpg)
![Drag[en]gine screenshot 1](https://d4.alternativeto.net/5i0hLWidTJz2srubydJJz40bnzu0lCS28EPqYRL2f5g/rs:fill:309:197:1/g:no:0:0/YWJzOi8vZGlzdC9zL2RyYWctZW4tZ2luZV83ODc4NDBfZnVsbC5wbmc.jpg)
![Drag[en]gine screenshot 2](https://d4.alternativeto.net/GwscdgM32EbFTJ0NcJILoP1Umu3AJyb7xKWaQc87qeo/rs:fill:309:197:1/g:no:0:0/YWJzOi8vZGlzdC9zL2RyYWctZW4tZ2luZV80NDM2NDBfZnVsbC5qcGc.jpg)
The Atomic Game Engine features a cross-platform editor with deployment to Windows, OSX, Linux, WebGL, Android, and iOS. Applications can be built using JavaScript, TypeScript, native C++, and C# scripting is in development.


LunarEngine (formerly Librebox) is an open-source game engine powered by Luau. It delivers a sandbox-style API and development model inspired by popular sandbox engines, so existing Luau code runs with minimal changes.

A 3D game engine for GameCube, Wii, 3DS, Windows, Linux, and Android.
Java framework providing unified API for building 2D or 3D games across desktop, mobile, and browser platforms, with hot code swapping, rapid prototyping, modular architecture, integrated physics, input, asset tools, and support for desktop-native debugging.
A game engine written in Python, extending support across multiple GPU devices with 3D rendering, PBR Renderer and much more.


Amethyst uses gfx-rs to render graphics with Vulkan or Metal. It is meant to be used for 2D and 3D, with various utilities for both types of games. It should be beginner friendly but also allow more advanced uses such as custom render passes and GLSL shaders.
App to create, play, and share AI-generated mobile games, no coding required.



The G3D Innovation Engine is a commercial-grade C++ 3D engine available as Open Source (BSD License). It is used in commercial games, research papers, military simulators, and university courses. G3D supports hardware accelerated real-time rendering, off-line rendering like ray...




batari Basic (bB) is a BASIC-like language for creating Atari 2600 games. It creates a binary file that can be run on an Atari 2600 emulator or the binary file may be used to make a cartridge that will operate on a real Atari 2600.