Open Source C++ Game Engines
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C++ Game Engines
View 35 business solutionsBrowse free open source C++ Game Engines and projects below. Use the toggles on the left to filter open source C++ Game Engines by OS, license, language, programming language, and project status.
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VCMI Project
Open-source engine for Heroes of Might and Magic III
VCMI is work-in-progress attempt to recreate engine for Heroes III, giving it new and extended possibilities. To use VCMI you need to own original data files. -
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3D game engine (more powerful redesign of the Cube engine) and FPS game
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Source Engine
Modified source engine (2017) developed by valve and leaked in 2020
The Source Engine repository under that particular GitHub user appears to be a custom (or forked) version of a game engine — likely an engine derived from or inspired by the classic Source engine lineage (or at least the name evokes that lineage). However, publicly-available documentation, community support or clarity about the project’s scope and maturity seems limited: the repo does not clearly advertise a full engine release or wide adoption. As such, it feels more like an experimental or hobby project: potentially a work-in-progress engine or engine-in-progress reimplementation rather than a full production-ready game engine. For a developer, this means you're likely to face missing features, limited tooling, and the need to fill gaps yourself, but also that you have a chance to influence or shape the architecture as you develop. -
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Unreal Engine 4/5 Scripting System
Injectable LUA scripting system, SDK generator, live property editor
Lua scripting system platform, C++ Modding API, SDK generator, blueprint mod loader, live property editor and other dumping utilities for UE4/5 games. The goal of UE4SS is not to be a plug-n-play solution that always works with every game. The goal is to have an underlying system that works for most games. -
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Multi Theft Auto: San Andreas
Multi Theft Auto is a game engine
Multi Theft Auto (MTA) is a software project that adds network play functionality to Rockstar North's Grand Theft Auto game series, in which this functionality is not originally found. It is a unique modification that incorporates an extendable network play element into a proprietary commercial single-player PC game. Multi Theft Auto is based on code injection and hooking techniques whereby the game is manipulated without altering any original files supplied with the game. The software functions as a game engine that installs itself as an extension of the original game, adding core functionality such as networking and GUI rendering while exposing the original game's engine functionality through a scripting language. Originally founded back in early 2003 as an experimental piece of C/C++ software, Multi Theft Auto has since grown into an advanced multiplayer platform for gamers and third-party developers. -
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A game engine for running Ultima7 on modern operating systems, plus a map-editor and other tools for creating your own mods and games.
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GDevelop
The game engine for everyone
GDevelop is an open-source, cross-platform game development software designed to make creating HTML5 and native games easy for everyone. Experts and novices alike can create their own games with GDevelop as it is fast and easy to learn, requiring no knowledge in a specific programming language. What makes GDevelop unique and so easy to use is its powerful and intuitive event-based system. Events are a powerful way to build up your game logic, without having to learn a programming language. GDevelop also features ready-made behaviors for your game objects, and allows you to create new behaviors through the easy to learn events. And when you're done, you can publish your game just about anywhere-- web, iOS, Android, Windows, Mac, Linux and even Facebook Messenger. Making games has never been easier or faster than with GDevelop! -
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Luanti
Voxel game-creation platform with easy modding and game creation
Luanti, originally known as Minetest, is a free, open-source voxel game engine and platform designed to let players, modders, and developers build and play diverse sandbox-style 3D worlds. Written in C++ for core performance and Lua for scripting, Luanti runs on multiple operating systems (Windows, macOS, Linux, BSD variants and even Android), making it highly accessible and cross-platform. Rather than being a single game, Luanti is meant as an engine and toolkit: individual “games” are actually collections of mods — written in Lua — that define terrain, items, NPCs, mechanics, and rules. This modular design enables rich customization and community-driven content: users can install new games, mods, and texture packs via a built-in content browser that draws from a central repository (ContentDB). Luanti supports both single-player and multiplayer via servers; players can host their own or join publicly listed ones, with server-side mods being applied automatically. -
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Flax Engine
Flax Engine, multi-platform 3D game engine
The most agile game engine is now available. Full source code. Full power. Fully featured. Flax Engine is a high-quality modern 3D game engine written in C++ and C#. From stunning graphics to powerful scripts - Flax can give everything for your games. Designed for fast workflow with many ready-to-use features waiting for you right now. Flax Visual Studio extension provides better programming workflow, C# scripts debugging functionality, and allows to attach to running engine instance to debug C# source. Unleash your creativity and be more productive. With Flax you can boost your game development and bring it to another level. We’ve created tools that are slim and agile. No more lagging actions, long importing, or slow compilation. Everything you do as a developer with Flax is meant to be instant. Flax was built up with the idea of giving more power to the creators. Game development tools we create are making this goal possible. -
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dhewm 3
dhewm 3 main repository
dhewm3 is a source port of the original Doom3 (not Doom3 BFG, for that you may want to try RBDoom3BFG). It’s known to work on Windows, Linux, macOS, FreeBSD, OpenBSD and AROS, but it should work on (or be easily portable to) any system that supports OpenGL 1.4 with ARB shaders, SDL and OpenAL. Compared to the original version of Doom3, dhewm3 has many bugfixes, supports EAX-like sound effects on all operating systems and hardware (via OpenAL Softs EFX support), has much better support for widescreen resolutions and has 64bit support. It only supports old Mods if they either don’t require their own game DLL or have been ported to dhewm3. Note that while the Doom3 source code has been released under GPL, you still need to legally own the game and provide dhewm3 the game data to play. See the How to Install section for more information. -
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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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fheroes2
fheroes2 is a recreation of Heroes of Might and Magic II game engine
fheroes2 is a recreation of the Heroes of Might and Magic II game engine. This open-source multiplatform project, written from scratch, is designed to reproduce the original game with significant improvements in gameplay, graphics and logic (including support for high-resolution graphics, improved AI, numerous fixes and user interface improvements), breathing new life into one of the most addictive turn-based strategy games. You can find a complete list of all of our changes and enhancements in its own wiki page. -
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Cocos Engine
Cocos simplifies game creation and distribution with Cocos Creator
The Cocos Engine repository powers the open-source core of Cocos Creator, a cross-platform game engine and editor designed for building 2D and 3D games for web and native targets. It aims to simplify game creation and distribution, with support for high-performance rendering, physics, scene management, asset pipelines, and more. The engine is built using a mix of C++ (for performance-critical systems) and TypeScript/JavaScript (for scripting), enabling developers to script game logic while relying on a robust, high-performance core. Because of its cross-platform nature, games built with cocos-engine (via Cocos Creator) can target mobile, desktop, and web, making it a popular choice for developers wanting flexibility and broad reach. The engine includes extensive tooling and example/demo projects to demonstrate 2D and 3D physics, animation, UI and rendering capabilities. -
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Open 3D Engine (O3DE)
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Easier team collaboration, artist workflows & multiplayer setup, increased terrain performance, new rendering features. Developed with cutting-edge, real-time graphics and complex interactions in mind, O3DE allows you to create robust, engaging experiences using our multi-threaded and extensible photorealistic renderer. O3DE's modular architecture is built for customization from day one. Each component, known as a Gem, can be adopted separately, giving you access to the specific functionality needed for your application. Add new editing tools, features, and development workflows to your projects. Choose from a variety of community-maintained Gems to extend and enhance the engine's capabilities in anything from AI and robotics to push notifications and VR.With our engine's SDK capabilities, you can use O3DE as a foundation for any type of 3D project you can imagine. -
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OGRE
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
OGRE (Object-Oriented Graphics Rendering Engine) is a scene-oriented, flexible 3D engine written in C++ designed to make it easier and more intuitive for developers to produce games and demos utilizing 3D hardware. The class library abstracts all the details of using the underlying system libraries like Direct3D and OpenGL and provides an interface based on world objects and other intuitive classes. We consider the results of our GL3Plus RenderSystem as the gold standard. The respective shaders are generated by the RTSS component with per-pixel specular lighting. Therefore the legacy render systems naturally have differences due to the use of fixed-function. However, when rendering diffuse surface both produce pixel-perfect results. Simple, easy to use OO interface designed to minimise the effort required to render 3D scenes, and to be independent of 3D implementation i.e. Direct3D/OpenGL. -
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Axmol Engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Axmol is a modern C++ game engine forked from Cocos2d-x, designed to support high-performance 2D and lightweight 3D game development across multiple platforms. It improves upon the original Cocos2d-x with a cleaner architecture, better tooling, and support for modern C++ standards. Axmol supports scripting with Lua and JavaScript, and is suitable for both indie developers and studios targeting mobile, desktop, and web platforms. With an active community and frequent updates, Axmol is a solid choice for cross-platform game development. -
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VoxelCore
Voxel game engine in C++ with OpenGL
VoxelEngine-Cpp is a minimal voxel engine written in modern C++ using OpenGL, GLFW, and GLM, inspired by Minecraft-style block worlds. It offers a clean foundation for learning and experimenting with voxel-based rendering and world generation. With features like chunk loading, perlin noise terrain generation, and basic lighting, the engine is a perfect starting point for developers who want to create sandbox games or explore the technical aspects of 3D voxel environments. -
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OpenRW
Recreation of the classic Grand Theft Auto III game executable
OpenRW is a cross-platform, open-source re-implementation of the game engine behind Grand Theft Auto III (GTA III). Its goal is to recreate the original gameplay engine in a modern, maintainable codebase so that GTA III can run natively on modern Windows, Linux, macOS, and BSD systems — long after the original executable becomes unworkable. The project does not ship with game content: users still need a legitimate copy of GTA III (with its original assets) to play, making OpenRW strictly an engine reimplementation, not a re-distribution. By re-writing the engine from scratch under a permissive, community-friendly license (GPLv3), OpenRW ensures long-term preservation, mod-friendliness, and better hardware compatibility (modern GPUs, controllers, cross-platform input, etc.). For developers, it also offers tools such as a “script tracer” to inspect in-game scripts opcode by opcode, a data-file viewer (RWViewer) for studying object data, models, and map files. -
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Doomsday Engine
DOOM / Heretic / Hexen source port with enhanced graphics and UI
A portable game engine for classic first person shooters such as DOOM, Heretic and Hexen. Lets you enjoy the original games using modern technology, including high-resolution OpenGL graphics, 3D models, and dynamic lighting effects. -
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Defold
Free game engine for development of desktop, mobile, and web games
Defold is an open-source, cross-platform game engine originally developed for 2D games but also capable of 3D — intended to give developers a turnkey solution for building games for desktop, mobile, web, and even consoles. It ships as a full editor/IDE, combining scene editing, asset management, scripting, and build/export pipelines, so developers don’t need to assemble disparate tools themselves. Game logic is written in Lua (with optional native extensions in C/C++ when needed), and the engine uses a component-based system and a message-passing paradigm to manage object interactions — a design that promotes loosely-coupled, reactive game code rather than traditional heavy OOP. Defold is optimized for efficiency: exported games tend to have small binary size and low memory use, making it appealing for mobile, HTML5/web, and lightweight games. -
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EasyRPG Player
RPG Maker 2000/2003 and EasyRPG games interpreter
EasyRPG Player is a game interpreter to play RPG Maker 2000, 2003, and EasyRPG games. It uses the LCF parser library (liblcf) to read RPG Maker game data. EasyRPG Player is a program that allows to play games created with RPG Maker 2000 and 2003. It aims to be a free (as in freedom) cross-platform RPG Maker 2000/2003 interpreter. The main goal is to play all games created with them as the original game interpreter (RPG_RT) does. This project is being developed. FreeType2 for external font support (+ HarfBuzz for Unicode text shaping) mpg123 for better MP3 audio support. WildMIDI for better MIDI audio support. Libvorbis / Tremor for Ogg Vorbis audio support. opusfile for Opus audio support. libsndfile for better WAVE audio support. libxmp for better tracker music support. SpeexDSP for proper audio resampling. -
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Spring RTS Engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Spring is a versatile 3D RTS game engine. Using extensively Lua for scripting game-specific code to make nearly every aspect of the engine customizable, from GUI, to unit AI, to pathfinding. -
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openage
Open source clone of the Age of Empires II engine
openage is a free cross-platform RTS game engine that provides the mechanics of Age of Empires. Using modern technologies as C++17, OpenGL/GLSL, Python, Qt5 and CMake allows people using GNU/Linux, BSD, macOS or Windows to play the game natively. Our aim is to make openage a platform for the original Age of Empires games providing the same look and feel, but with more features for modding and multiplayer. openage uses an open API powered by our human-readable configuration language nyan. We implement a client-server architecture with dedicated servers that supports more than 8 players. The overarching system will provide matchmaking, lobbies, server discovery and other community features. openage is a community project that values every contribution, the only requirement is your enthusiasm. Don't hesitate to get in touch with us if you want to help! -
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Gosu
2D game development library for Ruby and C++
Gosu is a 2D game development library for Ruby and C++. It’s available for macOS, Windows, Linux, and iOS. Gosu is focused, lightweight and has few dependencies (mostly SDL 2). It provides a window and a main loop. 2D graphics and text, powered by OpenGL or OpenGL ES. Sounds and music, keyboard, mouse, and gamepad input. Gosu is mostly used to teach or learn Ruby or in short game development competitions. It’s also a great prototyping tool and should work for indie game development, though nobody has really tried that. In addition to the documentation linked from the sidebar, there is a free book by Mark Sobkowicz that will guide you through the creation of four different games. -
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Blueshift Game Engine
Blueshift is a cross-platform 3D game engine implemented in C++
Blueshift is a cross-platform 3D game engine implemented in C++. it's free, open-source, and works on Windows, macOS, iOS, and Android. The project is currently in an early stage of development.