GAME ENGINES

Free and open source engines

These game engines are free software:

• Agar (engine) – A high-level graphical application framework used by 2D and 3D computer games
• Allegro library – A free crossplatform C/C++ game programming library, provides functions for graphics, sounds, input, timers, fixed and floating point, 3d, compressed datafile and a GUI.
• Axiom Engine – A fork containing the core of the OGRE graphics engine written in C#
• Game Blender – flexible node based game logic engine blender 3d
• Boom – A port of the Doom source code by TeamTNT
• Brick engine – A simple cross-platform 2D engine, intended for 8-bit-style games
• Cadabra 3D - A Brazilian LGPL 3D game engine
• Catmother – A BSD-licensed engine from a company that open-sourced its code when it closed the business.
• CheapHack – An outdated TomazQuake derived engine
• ClanLib – A free cross-platform (including Mac OS X), object-oriented C++ game programming library.
• Crystal Entity Layer – An extension of the Crystal Space 3D Engine
• Crystal Space – A general framework for developing 3D applications
• Cube – Powers the computer game of the same name
• DarkPlaces – One of the most advanced free software Quake engines
• Delta3d – Integrates other well-known free software projects into an easy-to-use API, originally developed by the U.S. Navy
• Doom engine – The now free software engine originally used for the hugely popular Doom and Doom II
• DXFramework – A simple, pedagogical 2D/3D DirectX-based game engine for Visual Studio
• Epee Engine – Is a 2D graphics engine with beginning programmers in mind
• Eternity Engine – A source port of the Doom engine
• Exult – A free software reimplementation of the Ultima VII game engine
• FIFE – A free software 2D isometric CRPG engine supporting the assets of Fallout 1 & 2.
• Freely Available Networked Game Engine - a 2D Java networked game engine
• GQ – A Quake engine that adds features from TomazQuake and DarkPlaces
• GZDoom – A source port of the Doom engine based on ZDoom
• GemRB – A free software implementation of the Infinity Engine
• Genesis3D – A real-time 3D engine for Windows
• Genesis Device Is a powerful LGPL engine
• Horde3D – A lightweight next-generation graphics engine
• id Tech 2 – Formerly known as the Quake II engine, the original open-source engine from id Software

• id Tech 3 – Formerly known as the Quake III engine, the original open-source engine from id Software
• ioquake3 – A cleaned-up, bugfixed and updated fork of the original id Tech 3 engine
• Irrlicht Engine – A cross-platform and lightweight three dimensional graphics engine.
• jMonkeyEngine – An open-source, BSD licensed Java scenegraph engine.
• JGame - An open-source, BSD licensed 2D Java game engine, support mobile devices and desktop application.
• Joge – Is a platform to develop 2D game in Java.
• Jogre – A Java based client/server game engine and API for online real time games such as chess, checkers, etc.
• KallistiOS – A free, BSD licensed development library for the Sega Dreamcast, by Dan Potter.
• KonsolScript – opensource cross-platform 2D game engine plus scripting capability, by MJ Mendoza IV.
• Libsmog – opensource, C++, massively multi-player, script-able, real-time 3D game engine.
• Lightfeather 3D Engine - A cross-platform, zlib licensed, real-time 3D graphics engine.
• Nebula Device – A realtime 3D game engine developed by German game studio Radon Labs.
• OctLight – A Java game engine that uses scene-graph and renders on top of Lightweight Java Game Library (LWJGL) using OpenGL
• Open Game Engine is an open source library combining the components used to make games.
• OGRE Engine – A very popular object-oriented graphics rendering engine. Also called OGRE3D
• PLIB – A game engine – includes 3D, Audio, Music, GUI, Window manager and is portable Linux/Windows/Mac OS X.
• ProQuake – A modified Quake engine
• PySoy - Multi-threaded 3d game engine for Python, freely licensed under the GPLv3 for Linux, Mac OS X, and Windows
• Reality Factory - An open-source engine built off of Genesis3D.
• RealmForge – An open-source game engine for the Microsoft .NET Framework, predecessor to Visual3D.NET
• Retribution Engine – A game engine to make first person shooter games
• Sauerbraten – A upgraded engine forked from the Cube engine
• southatlantic – Open Source 2D java game engine (applets and applications).
• Soya 3D – Object oriented "high level" 3D engine for Python.
• Stratagus – A cross-platform real time strategy game engine
• Sylphis3D – Game engine with unified lighting and shadowing, physics and fully python scripted!
• Telejano – A modified Quake engine
• Tenebrae – One of many Quake engine clones
• vbGORE – Open source MMORPG engine in Visual Basic 6.
• Elysium Diamond – Another open source MMORPG engine made with Visual Basic 6.
• Verge RPG engine - A BSD-licensed open source game engine that uses a C-like scripting language called, VergeC.
• Victory Engine - A Java-based 2D game engine, designed with flexibility in mind.