Open Source Game Engines
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Game Engines
Browse free open source Game Engines and projects for Linux and ChromeOS below. Use the toggles on the left to filter open source Game Engines by OS, license, language, programming language, and project status.
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3D game engine (more powerful redesign of the Cube engine) and FPS game
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GemRB Game Engine
GemRB is a portable open-source implementation of the Infinity Engine
GemRB (Game engine made with pre-Rendered Background) is a portable open-source implementation of Bioware's Infinity Engine. It was written to support pseudo-3D role playing games based on the Dungeons & Dragons ruleset (Baldur's Gate and Icewind Dale series, Planescape: Torment). It should run on GNU/Linux, Microsoft Windows, OS X, possibly other UNIX derivatives and more. It is licensed under the GPL. -
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ursina
A game engine powered by python and panda3d
ursina is an easy-to-use, open source game engine and framework for Python that is built on top of Panda3D, aiming to make game development approachable while still being powerful enough for real projects. It lets you create both 2D and 3D games, applications, and visualizations by writing concise Python scripts instead of dealing with a lot of low-level boilerplate. The engine is centered around an Entity-based architecture, where everything in the scene is an object you can easily configure and manipulate from code. Ursina focuses heavily on iteration speed, offering in-game reloading of code, textures, and models so you can tweak and test changes quickly. It includes many batteries-included features such as a mesh API for procedural geometry, built-in animation and tweening, pre-made controllers like FirstPersonController and EditorCamera, and a library of shaders and 3D primitives. -
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Amazon Lumberyard
Amazon Lumberyard is a free AAA game engine
Amazon Lumberyard is (or was) a free AAA-capable game engine developed by AWS, with deep integration into AWS cloud services and the Twitch streaming platform. It provided full source access and offered developers tools to build high-quality games and simulations with networking, rendering, physics and cloud backend features built in. The engine allowed game creators to hook into AWS infrastructure for multiplayer services, analytics, voice chat, and more, and leveraged Twitch to build live-stream-enabled experiences. Although Amazon has since archived the repository and transitioned focus to the open-source successor Open 3D Engine (O3DE), the project remains of interest as a large-scale example of cloud-enabled game engine architecture. Developers studying game tech or infrastructure integration can inspect how the engine’s subsystems were designed, including entity/component architectures, rendering pipelines and networked game services. -
MongoDB Atlas runs apps anywhereMongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
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Matter.js
A 2D rigid body physics engine for the web
Matter.js is a flexible 2D rigid body physics engine written in JavaScript, designed for use in web applications to simulate real-world physical interactions within the browser. It offers a comprehensive set of physics features like gravity, collisions, restitution (bounces), friction, sleeping bodies, and constraint systems that enable developers to build interacting objects with realistic motion. This engine can power everything from dynamic interactive animations and educational simulations to fully fledged physics-based games, and it works across major browsers and devices. Through modules such as Matter.Body, Matter.Composite, and Matter.Constraint, developers can create complex scenes with multiple bodies, jointed structures, and collision responses. Matter.js is popular in the web development community due to its simplicity, extensibility, and rich documentation, allowing both beginners and experienced programmers to leverage physics without deep expertise. -
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VASSAL is a game engine for creating electronic versions of traditional board and card games. It provides support for game piece rendering and interaction, and supports play by email or over a live connection.
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Descent 3
Descent 3 by Outrage Entertainment
The Descent3 repository is the open source release of the Descent 3 game engine by Outrage Entertainment, maintained by the community under the GPL-3.0 license. It provides the full C and C++ engine source code, including the historically significant “1.5” patch that was previously created by developers and later stabilized by fans. The codebase covers the game’s rendering, physics, audio, networking, tools, and editor components, allowing enthusiasts to build, run, and modify the classic 6-degrees-of-freedom space shooter on modern systems. To actually play the game, users must supply their own original game assets, following instructions in the repository’s usage documentation. The project uses CMake and related modern tooling for cross-platform builds, with support for Linux and Windows among other environments. A dedicated community maintains the engine, publishes updated releases, documents internals on a wiki, and coordinates contributions via an active Discord server and GitHub. -
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Planck.js
2D JavaScript Physics Engine
Planck.js is a JavaScript rewrite/port of the physics engine Box2D, designed to provide 2D rigid-body physics simulation usable directly in web contexts or any JavaScript environment. By offering collision detection, rigid-body dynamics, joints, and simulation capabilities, Planck.js makes it possible for developers to build physically realistic 2D games, simulations, or visualizations in browsers or Node.js without relying on native code. Its API mirrors Box2D’s concepts — bodies, fixtures, shapes, joints — which makes it familiar to users of classic Box2D, while being idiomatic for JavaScript developers. Because it's pure JavaScript, Planck.js integrates easily with HTML5 canvas, WebGL, or other browser-based rendering pipelines, facilitating smooth physics-driven games across platforms. It also is conducive to rapid prototyping and experimentation, since it avoids the complexity of compiling native libraries for web. -
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Spartan Engine
A game engine with an emphasis on real-time cutting-edge solutions
SpartanEngine is a C++ game engine focused on cutting-edge real-time rendering and simulation, developed primarily as a long-running personal research project and now grown into a community-driven platform. It centers around a modern Vulkan renderer (with an in-progress DirectX 12 backend) and a fully bindless, unified deferred rendering pipeline designed to handle hundreds of millions of instances. The engine implements a wide range of advanced graphics features, such as atmospheric scattering, physically based shading, screen-space shadows and ambient occlusion, screen-space reflections, sophisticated shadow mapping, volumetric fog, and HDR output. It supports next-gen performance and image quality technologies including variable rate shading, dynamic resolution scaling, temporal anti-aliasing, and upscaling via XeSS 2 and FSR 3. Beyond rendering, SpartanEngine offers PhysX-powered physics, CPU and GPU profiling, a thread pool for parallel workloads. -
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Castle Game Engine
Game engine supporting many 3D/2D formats and graphic effects
This project has moved to: - Our website https://castle-engine.io/ - GitHub repo: https://github.com/castle-engine/castle-engine/ Cross-platform 3D and 2D game engine for Object Pascal. Rendering and processing of game assets in glTF, X3D, VRML, Collada, Spine and other formats. Many graphic effects including shadows, shaders, mirrors, screen effects. Animation, collision detection, 3D sound. Extensible system of 3D objects, with out-of-the-box levels, items, intelligent creatures and more. Desktop, mobile, web plugin. Also home of view3dscene - our full-featured VRML/X3D browser. -
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CoffeeMud
Full featured MUD server with all the trimmings.
CoffeeMud is a text-based virtual reality game engine (a MUD). It is a mature, full-featured Java codebase. It includes web (HTTP) and email (SMTP) servers, chat (IMC2 and I3) and web clients, and supports ANSI, MXP, and MSP. -
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Haxima is an Ultima-like game engine (2D tile graphics) with combat, magic, NPC AI, an embedded scripting language, and in-game editing.
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Ambient
The multiplayer game engine
Ambient is an open-source, cross-platform runtime and engine for building and deploying high-performance multiplayer games and 3D applications, using a modern stack built on Rust, WebAssembly (WASM), and WebGPU. It aims to make multiplayer game development accessible and flexible, providing an entity-component-system (ECS) at its core that doubles as a real-time in-game database; everything in the game — from world objects to runtime data — is represented as entities + components, which can be synchronized across clients automatically. Ambient supports a package-based workflow reminiscent of Rust’s crate system, where “packages” bundle code, assets, and schema definitions; this modular design encourages reuse, mixing, and sharing of content. The engine includes an asset pipeline that can stream and load common 3D formats (e.g. GLB, FBX) on demand, so players don’t need to pre-download large asset bundles — the engine handles asset streaming. -
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Godot Minimal Theme
Godot Minimal Theme
Godot Minimal Theme is not a game engine itself, but rather a custom editor theme designed for Godot Engine — aiming to offer a clean, minimalistic, and visually comfortable interface for the Godot editor. The theme adjusts base colors, accent colors, contrast, icon saturation, corner radii, fonts, and other UI settings to deliver a more modern, streamlined, and easier-on-the-eyes editor appearance. It has been tested and confirmed compatible with several recent Godot versions (4.3, 4.4, 4.5), and many users believe it significantly improves the usability and aesthetic of the Godot editor, especially for extended coding or scene-building sessions. By offering a well-tuned default set of UI parameters (color scheme, font recommendations, layout tweaks), it saves users the trouble of configuring their own setup — and ensures consistency across different projects or machines. Because it’s open source, users can further customize or fork it to suit their personal preferences. -
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nunuStudio
Web powered cross-platform 3D, WebXR game engine
nunuStudio is an open-source editor + game development environment — a “studio” rather than just a library — designed to let developers create interactive 2D and 3D content through a user-friendly interface. It provides visual tools for scene editing, asset management, materials, and possibly scripting, aiming to reduce the friction of hand-coding every aspect from scratch. As an accessible entrypoint to game or interactive content creation, nunuStudio is well-suited for artists, designers, or developers who prefer a WYSIWYG (what you see is what you get) workflow instead of fully coding everything. Because it is open source, users can inspect, modify, or extend the system as needed — adding custom behaviors, plugins, or export options. It’s ideal for rapid prototyping, small games or interactive demos, or educational purposes: you can build scenes, tweak visuals, test interactivity without deep diving into all low-level rendering details. -
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Orx: Portable Game Engine
Orx: Portable Game Engine
Orx is a portable, lightweight, plugin-based, data-driven and extremely easy to use 2D-oriented game engine. As orx is data driven, it allows users to create games with a small number of lines of code and reduces drastically the development time. -
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Smokin' Guns is a GPLv2 licensed first person Western style shooter based on the Quake 3 engine (Id Tech 3) developed by a loosely knit team of developers and artists. This project represents the game engine.
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OpenMoHAA is a game engine that is compatible with Medal of Honor: Allied Assault media and network protocol, based on the ioquake3 project.
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Mingro
Old-school 2D game engine
An old-school game engine, much like good old ID and Apogee games as Duke Nukem, Commander Keen and Biomenace, slightly inspired by Diana Gruber's "Action Arcade Adventure Set". Made with Allegro.pas and programmed in Pascal. -
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Rails is a Java game engine intended to play any of the 18xx series of turn-based board games For 3-6 players and set in the 19th century, these games allow players to step into the shoes of the robber barons and railroad tycoons of the time period..
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ArcadeGPU
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
ArcadeGPU is a high performance WebGPU game engine inspired by classic techniques that made retro games legendary. Explore demos: https://aliyah-corp.github.io/ -
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Kambi VRML game engine
Game engine supporting many 3D/2D formats and graphic effects
This project has been renamed to "Castle Game Engine" and moved to: - Our website https://castle-engine.io/ - GitHub repo: https://github.com/castle-engine/castle-engine/ Cross-platform 3D and 2D game engine for Object Pascal. Rendering and processing of game assets in glTF, X3D, VRML, Collada, Spine and other formats. Many graphic effects including shadows, shaders, mirrors, screen effects. Animation, collision detection, 3D sound. Extensible system of 3D objects, with out-of-the-box levels, items, intelligent creatures and more. Desktop, mobile, web plugin. Also home of view3dscene - our full-featured VRML/X3D browser. The "Kambi VRML game engine" is renamed to "Castle Game Engine" (short name castle-engine). For commits and all current information see castle-engine project. -
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Captains Game Engine
Portable game engine with main focus on point-and-click adventures
This project aims to create a fast game engine that is simple to use. It will support rendering in OpenGL and DirectX and run on Linux, Windows and Android. It even runs in the browser with WebGL through emscripten. It was originally used to create a round-based 3D multiplayer role-playing game called Heroquest. Now, the main focus has shifted to create a portable point-and-click adventure system and some adventure games. -
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Gold Chest is a new game engine inspired by the old gold-box styled RPG games. My goal is to create a game with the same Look and Feel of the gold-box games while bringing to it newer graphics, sounds, music and network play.
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JavaScript Graphic Adventure Maker
Javascript adventure game engine
JSGAM is an open source Javascript game engine focused on classic graphical point-and-click adventure games. The project is being rewritten from scratch. The new code can be found now in Github (https://github.com/kreezii/jsgam).
