Alternatives to Unity in 2026

Godot godotengine

Godot Engine – Multi-platform 2D and 3D game engine

Framework or platform Production-ready You want a royalty-free engine for 2D games or small to mid-size 3D games.

★ 119k MIT C++ Active, pushed today

Bevy bevyengine

A refreshingly simple data-driven game engine built in Rust

Framework or platform Usable You want to make games in Rust and are comfortable with code-first development.

★ 49k Apache-2.0 Rust Active, pushed today

Raylib raysan5

A simple and easy-to-use library to enjoy videogames programming

Framework or platform Production-ready You want to learn game programming or build small games and tools with a minimal API.

★ 36k Zlib C Active, pushed yesterday

Babylon.js BabylonJS

Babylon.js is a powerful, beautiful, simple, and open game and rendering engine packed into a friendly JavaScript framework.

Framework or platform Production-ready You build 3D games, product configurators or XR experiences that run in the browser.

★ 26k Apache-2.0 TypeScript Active, pushed today

libGDX libgdx

Desktop/Android/HTML5/iOS Java game development framework

Framework or platform Production-ready You want to write 2D or simple 3D games in Java or Kotlin for desktop and Android.

★ 26k Apache-2.0 Java Active, pushed yesterday

OpenRA OpenRA

Open Source real-time strategy game engine for early Westwood games such as Command & Conquer: Red Alert written in C# using SDL and OpenGL. Runs on Windows, Linux, *BSD and Mac OS X.

Complete system Production-ready You want to play or mod classic Command & Conquer games on modern systems.

★ 18k GPL-3.0 C# Active, pushed 5 days ago

Engine playcanvas

Powerful web graphics runtime built on WebGL, WebGPU, WebXR and glTF

Framework or platform Production-ready You build performant browser 3D experiences and may use PlayCanvas's hosted editor.

★ 17k MIT JavaScript Active, pushed today

Ebiten hajimehoshi

A dead simple 2D game engine for Go

Framework or platform Production-ready You want to make 2D games in Go with a small, stable API.

★ 14k Apache-2.0 Go Active, pushed today

EnTT skypjack

Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

Building block Production-ready You are building a C++ game or simulation and want a proven ECS.

★ 13k MIT C++ Active, pushed today

Boardgame.io boardgameio

State Management and Multiplayer Networking for Turn-Based Games

Framework or platform Usable You are building an online board or card game in JavaScript.

★ 12k MIT TypeScript Active, pushed 3 days ago

JoltPhysics jrouwe

A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.

Building block Production-ready You need fast, stable 3D physics for a game engine or VR application.

★ 12k MIT C++ Active, pushed yesterday

Flame flame-engine

A Flutter based game engine.

Framework or platform Production-ready You already use Flutter and want to make casual 2D games for mobile and web.

★ 11k MIT Dart Active, pushed today

Fyrox FyroxEngine

3D and 2D game engine written in Rust

Framework or platform Usable You want to make games in Rust and prefer a traditional engine with an editor.

★ 9.6k MIT Rust Active, pushed today

Stride stride3d

Stride (formerly Xenko), a free and open-source cross-platform C# game engine.

Framework or platform Usable You want a C# 3D engine with an editor and full source access as an alternative to Unity.

★ 7.9k MIT C# Active, pushed today

WickedEngine turanszkij

3D engine with modern graphics

Framework or platform Usable You want a modern C++ graphics engine to learn from or build a project on.

★ 7.3k MIT C++ Active, pushed today

melonJS melonjs

A modern & fully featured HTML5 game engine (2D & 3D) for JavaScript/TypeScript, with WebGL/WebGPU rendering, built-in physics, Tiled map & glTF support and WebAudio.

Framework or platform Production-ready You make 2D browser games, especially tile-based ones built with Tiled.

★ 6.4k MIT JavaScript Active, pushed today

Redot-Engine Redot-Engine

Redot Engine – Multi-platform 2D and 3D game engine

Framework or platform Usable You prefer Redot's governance over Godot's and accept a smaller community.

★ 6.2k MIT C++ Active, pushed yesterday

Horizon horizon-rust

Minecraft: Java Edition 26.3 rewritten from scratch in Rust, checked against vanilla with 281 differential harnesses. Get it with the Horizon launcher.

Complete system Experimental You are curious about a faster Minecraft-compatible client and comfortable with alpha software.

★ 6.1k MIT Rust Active, pushed today

Planck.js piqnt

2D JavaScript Physics Engine

Building block Usable You need 2D rigid body physics in a browser game.

★ 5.3k MIT TypeScript Active, pushed 10 days ago

FXGL AlmasB

Java / JavaFX / Kotlin Game Library (Engine)

Framework or platform Usable You teach or learn game development in Java, or already use JavaFX.

★ 4.9k MIT Kotlin Active, pushed 17 days ago

Ggez ggez

Rust library to create a Good Game Easily

Framework or platform Usable You want a simple Rust framework for small 2D games without an ECS.

★ 4.7k MIT Rust Active, pushed 7 days ago

Macroquad not-fl3

Cross-platform game engine in Rust.

Framework or platform Usable You want quick-to-compile 2D games in Rust that also run in the browser.

★ 4.7k Apache-2.0 Rust Active, pushed 3 months ago

LittleJS KilledByAPixel

Tiny fast 2D/3D HTML5 game engine with many features and no dependencies.

Framework or platform Usable You make small 2D browser games or enter size-limited game jams.

★ 4.4k MIT JavaScript Active, pushed yesterday

A-Frame aframevr

:a: Web framework for building virtual reality experiences.

Framework or platform Production-ready You want to build browser-based VR or 3D experiences quickly with declarative markup.

★ 18k MIT JavaScript Slowing, pushed 4 months ago

Entitas sschmid

Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity

Building block Usable You maintain a Unity project already built on Entitas.

★ 7.7k MIT C# Quiet, pushed 3 years ago

Piccolo BoomingTech

Piccolo (formerly Pilot) – mini game engine for games104

List, course or other material Experimental You are following GAMES104 or want a compact engine codebase to study.

★ 6.7k MIT C++ Quiet, pushed 2 years ago

Pixel faiface

A hand-crafted 2D game library in Go

Framework or platform Experimental Not for new work; development has moved to the Pixel2 repository.

★ 4.5k MIT Go Quiet, pushed 2 years ago

NoahGameFrame ketoo

A fast, scalable, distributed game server engine/framework for C++, include the actor library, network library, can be used as a real time multiplayer game engine ( MMO RPG/MOBA ), which support C#/Lua script/ Unity3d, Cocos2dx and plan to support Unreal.

Framework or platform Experimental Only to study its architecture or if you maintain a game already built on it.

★ 4.2k Apache-2.0 C++ Quiet, pushed 4 years ago

Unreal Engine Epic Games

Whatever your vision, bring it to life with Unreal Engine: the world's most advanced real-time 3D creation tool. Join our community of developers and get started today.

Framework or platform Production-ready You need high-end 3D graphics for games or film and have C++ skills or a team to use Blueprints well.

13k readers a month Commercial

GameMaker Opera

Game creation system

Framework or platform Production-ready You make 2D games, especially solo or as a beginner, and want a focused tool that ships to many platforms.

1.9k readers a month Since 1999 Commercial