Open Source Desktop Operating Systems Game Engines

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

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.

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.

A very small and excellent Game Engine created in C++ using the SDL libraries. Runs on multiple platforms.

Alpha: - Still in heavy development, but should be stable enough for use in small projects. - Features include OpenGL ES based scene graph system, sound (static and streaming), input handlers, scheduler, async job queues, and much more. - Supported platforms include iOS, Android, OSX, Linux, Windows, HTML5 (Emscripten).

DjDoom is a reference implementation for the original Doom game engine. The purpose of this project is to build a playable Doom engine from the original Linux source code with minimal changes necessary to build and run in a Windows environment. This was created as a learning tool for me and I'm publishing this so it can be a learning tool for others. It is intended that this be a base for others to build and expand on.

This game engine uses the power of C++, OpenGL, and OpenAL to provide highly-portable, object-oriented code for programming a video game. Rather than tailoring to a specific type of game, the engine focuses on the fundamental components. It covers audio, graphics, controls, and data flow. With G2, developers have everything they need to create a 2D game without the need of expensive SDKs.

IRE is a tile-based Computer Role-Playing Game engine based on Ultima 6, but with an emphasis on customisation and cross-platform support. Everything is controlled using scripts.

Simulate dice roll mechanics from the comfort of your vintage Tandy TRS-80 Model 100/102/200 ("Model T") laptop! Roll any die from d1 to d4200 (why not, you know you want to!) or use one of the built-in systems. Designed to pass around your table, the Model T Dice Box brings a retro new dimension to any game night! Dice Box supports a variety of popular RPG systems and dice mechanics including standard dice expressions (A+*dX+-*B+-L:H), exploding dice pools, full Continuum support (yes, that really is the best time-travel RPG you might never play), and one-off rolls like Traveller's d66. See the feature list for more RPG systems available! This project includes the compact source code (.DO), the tokenized BASIC (.BA), and a REX image (.BY). Dice Box needs around 1KB memory while running and the tokenized BASIC file is ~12KB. And check out the video! Fun fun fun! Files also available at: http://www.club100.org/memfiles/index.php?&direction=0&order=&directory=Steve%20Baker

An object-oriented Game Engine. It abstracts the differences between platforms and allows level/scene coding through script/XML files. Subsystems based on open source libraries. Adaptable to multiple game genres (fps, space shooter, indoor, outdoor, ...)

qbism Super8 is an open source 3D game engine with advanced yet intentionally retro 8-bit graphics for a crunchy pixelated look. The source code is forked from Makaqu Quake with enhancements from other Quake projects. The goal is to expand capabilities of authentic software-rendering without sacrificing performance. Features ———— Real 8-bit software graphics Plays most modern epic Quake maps that require enhanced engine limits and extensions. Colored static and dynamic lights. Scorch marks (stainmaps), fog, transparent water and particles, and skyboxes. Unique indexed colored lighting that doesn’t slow down the engine. Plays nice with weird laptop screen resolutions and Windows XP/ Vista/ 7. Record demos directly to xvid, mp4, divx, or other avi-compatible formats. Start and stop demo recording any time during a game. Start and stop video recording any time during a game or demo. Fisheye mode! [Optimize me!] Mothballed project: QBismFusion = enhanced QFus

An open-source, SDL based, game engine to replicate old style Rockman (aka Megaman) games, being as close as possible of Rockman 1-6, and an editor made with Qt, for custom graphics, weapons, bosses, enemies and level creation. Please access our web page for more details. The engine code is meant to be highly portable, thanks to SDL, and have been ported and tested in: - Linux - Windows - macOSX (x86) (not currently supported) - Playstation 2 - Nintendo DS (abandoned) - Dingux - Open Pandora Any system with SDL and 24 or 32 MB should be able to run it. Porters are welcome!

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.

WFIRE is a low-level game engine which provides a portable library allowing for writing video games for multiple classic targets. Originally written for a game called the Crypts of Eldor, WFIRE aims to provide compatibility with a number of constrained environments, such as DOS and the Amiga. It also aims for "new-retro" computers such as the Commander X16 and the Neon816. Of course, modern operating environments such as Windows NT and GNU/Linux are also planned. WFIRE is meant to reduce the effort of writing your own game engine by providing a common framework for functions such as rendering, sound output, and display management.

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

a very flexible game engine to distribute your games very fast, very easy it provide many features such as sound playing, threading, memory management, and many others!