Open Source C++ Game Engines

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.

Aleph One is the open source continuation of Bungie's Marathon 2 FPS game engine. Aleph One plays Marathon, Marathon 2, Marathon Infinity, and 3rd-party content on a wide array of platforms, with (optional) OpenGL rendering, Internet play, Lua scripting, and more.

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.

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

This is the last know development of Yeti3D before the project was shelved. It was a nice engine in its time, and might have code in it still worth something to someone. Its a portable 3D game engine with fast software rendering.

Haxima is an Ultima-like game engine (2D tile graphics) with combat, magic, NPC AI, an embedded scripting language, and in-game editing.

PLEASE NOTE: Project development moved to Github! https://github.com/opentomb Here you can find ONLY nightly builds for Windows. OpenTomb is an engine that can play classic Tomb Raider 1 - 5 levels and custom TRLE levels. It is developed for fans and fun. Some code was taken from OpenRaider project and Quake Tenebrae project. Resource loading routines are taken from http://icculus.org/vt/vt/ project. It is developing in netbeans 7 + GCC TDM 4.9.2 Used libraries: SDL2, SDLimage with jpeg and png libs, vorbis (ogg support), OpenGL, OpenAL, freetype 2, LUA, BULLET. Youtube engine work example: http://www.youtube.com/watch?v=Jf3JGm67oS0 I need some help in game behavior algorithms, level parsing, e.t.c. Needed for work: 1) Original Tomb Raider levels 2) Font .ttf 3) Config files (config.lua and autoexec.lua)

A Simple Top Down Game Engine for Linux and Windows obs: in development pre-alpha stage, not fully playable

OliveChess is a simple chess engine compatible with modern chess interfaces such as ChessBase products, Arena and XBoard/Winboard. The engine supports UCI and XBoard protocols. Note: in order to use it as an xboard engine you may need Polyglot tool to be installed first

AquaEngine is supposed to be a modern game-engine with BulletPhysics in combination with ODE for vehicle physics. Rendering is using OGRE and OpenGL.

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.

Cross platform 3D game engine based on OpenGL and C++

JavaScript game engine focused on 2D multi-player (networked) games. The idea is to provide a tool for learning by writing computer games. EGachine is based upon a extensible JavaScript shell (EJS) and modules providing functionality for writing games.

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

This is a small project I have been working on in my spare time for enrichment. This used to compile for Sony PSP, but too much functionality has been added sense the last PSP build to compile. Development happens on a tiny netbook and my custom built gaming rig. The goal is to make it playable on the Netbook, and currently acceptable on a capable machine.

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.

Action/RPG Game Engine. Overall game engine is to be open source, but not the art assets.

As of now, an independently developed graphics/physics engine for use with DirectX9/DirectX11 and C++. I'm only working on this during my free time, so it will not be updated too often unless I have something major to add to it. Outside insight would be appreciated.

Project is to maintain the open source tree for the Azusa Derived Distribution Edition of the SIO2 SDK v1.4 Game Engine Free Ed., previously distributed by sio2interactive.com in the book by Tony Mullen, "3D for iPhone Apps with Blender and SIO2."

A free and open source game engine designed to simplify the game creation process. Anyone can contribute, but they may not commit to the repository. In order to have a change made by you committed, submit it to OniLink10 (at) gmail (dot) com.

A basic 2D Game engine written in C/C++ It uses OpenGL, OpenAL, Xaudio2, and the standard C/C++ libraries. THIS IS INTENDED FOR DEVELOPERS ONLY!

Terra Tenebrae is a free (as freedom) multi-Players RPG game engine based on client/server technology. The assets used are in licenses CC0, CC-by, CC-by-sa or GPL.

Tactical, turn-based game engine, that uses OpenGL and WinAPI specific. In the initial phase of development will focus on the general game logic, in an elegant pack of std. C++. This project in principle, can be described as academic. Feel free to to review the code, any remarks and comments.