Open Source Game Engines

3D game engine (more powerful redesign of the Cube engine) and FPS game

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.

!!! The project repositories have been migrated to https://github.com/urho3d/Urho3D !!!

UEVR is a powerful VR mod for Unreal Engine games, supporting versions 4.8 to 5.4. It offers full 6DOF and stereoscopic 3D support out of the box, along with three rendering modes: Native Stereo, Synchronized Sequential, and AFR. It works with OpenVR and OpenXR runtimes, enabling a smooth VR experience with optional roomscale movement and motion controls. UEVR also features a user-friendly GUI, in-game menu, and per-game configurations, allowing modders to enhance VR functionality with C++ and Blueprint support.

KlayGE is an open source, cross-platform game engine with plugin-based architecture. It provides a framework to make game development, testing, porting as simple as possible.

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.

Kochol Game Engine(KGE) is an object-orianted hardware accelerated 3D Game engine. Easy to use and powerful engine for cutting edge games.

CorEngine is a work in progress, OpenGL graphics powered 3D game engine designed to help independent game developers with quick prototyping and game/virtual environment creation. The engine supports a standard set of features, like skeletal animation, post processing, Lua/C programming, physics powered by Bullet Physics, GUI and 2D/3D Audio.

Create C/C++ 3D games easily! Game engine including higher-level functions and highest-level that are little less than working games! Include an audio system, an thread system, events, entities, physics, etc. This engine is written in C and C++. But can be used from both languages. It is powered by glib, Irrlicht engine, OpenAL, ODE, Ogg vorbis, etc

GEK (Game Excelleration Kit) is a game engine focused on providing interactive 3D simulations.

MARGE is Mobile Augmented Reality Game Engine for iPhone, Android and Symbian Platforms. Currently developed for iPhone platform only. The MARGE developed by Mobile Interactive Media and Entertainment Group of NUS. www.mimelab.com

The Medusa Engine is a C++ based engine. This engine was used to develop "DarkSpace" a space based MMORTS released in 2001.

MyWorld is an open virtual reality and game engine. It is written and usable in C/C++. It has own abstract layers for Graphics and Physics. Actually we use Irrlicht for 3D-Rendering and GUI, and ODE for Physics. It is smart, powerful and easy to extend.

OpenMind is a scene graph written ont top of OpenGL for Java. It already features hierarchical scene managment and object transform, full dynamic cameras, lights and fog, 2D UI elements scenegraph managment, 2D and 3D mouse picking, and more...

OpenReality will be a 3D Engine Library for development of Games, Virtual Reality and 3D Visualization applications. It will be very intuitive, and strongly object oriented. Of course, performance will have a great weight on the project´s decisions.

PSYGEN stands for Procedural Synthesis Graphics Engine. It's a game engine with focus on procedural content generation. PSYGEN's main characteristic is the ability of generating and viewing a massive procedural world in real time.

UPDATE 2014-06-01: As there are still lots of weekly downloads I need to clarify the TXna status. The Xna 3.1 based version is no longer developed, there are no commits for over two years. Instead a port to MonoGame is in progress. Please use the TXnaGE from the \branches\monogame folder! The monogame version is based on mongame 3.2.2 and has most of TXna features except: shadowmapping, modelscenenodes and instancing - those features are in development! Titanium Xna Game Engine is a Xna 3.1 based game engine written in c#. Complex scenes can be build in just few lines of code. The developer is free to combine TXna features and standard Xna techniques without any limitations. Please use the svn checkout or update feature to get the latest source and compile from source. The engine is not released frequently but only after major source updates. Chances are that by downloading a release you will get a rather old copy.

A 3d game engine based on a realtime software raytracer. Currently, the following features are available : primary rays, shadows, cel shading and phong shading. Recommended hardware : modern CPU (such as Intel's core i5 or AMD FX models). This library will be used later on to develop a game. Work in progress.

TurboSphere is an intuitive and easy to learn game engine. It is generally modeled after the Sphere RPG engine for its API, although the API has been modernized. It uses JavaScript as its game logic language, and supports many common file types for resources. TurboSphere uses Google V8 for JavaScript execution and SDL for graphics, audio, input and most other game related functions. It includes a map engine intended for top-down, zelda like games. Other, script based map engines are possible, and several have been implemented for TurboSphere's predecessor, Sphere (like the Majestic Map Engine (http://spheredev.org/smforums/index.php?topic=4496.0)). TurboSphere is largely compatible with the Sphere RPG engine, the main API change is the replacement of object creating functions with proper JavaScript constructors. This means that there are several completed games already made that work with TurboSphere, requiring only a small set of compatibility scripts to function in TurboSphere.

The VROnline project is universal 3D virtual reality engine for games with client/server architecture, free 3D camera, user configurable actions and AI scripts. It's based on C# and directX (now 9.0) technology. It can manage many data models(rpg,sims).

Vivid is a modern C++ 3D engine using OpenGL4+. It is written using Visual C++ 2022, and relies on several open source projects to achieve it's goal of making it easy and run to make modern games with it.

Vivid3D is a C++ IDE/3D engine, with python scripting. - It uses DX12 or Vulkan, and will support RTX features. It features gameplay facilitated by Python.