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SxDL is a 2D and 3D Game development framework for writing games for Windows using DirectX. You use the functions in the game development toolkit to handle objects usually needed in video games such as graphics, keyboard input, mouse input, joystick input, music, sound, timing, game loops, etc. All rendering is done through predefined objects like sprites, lines, tile maps, 3D models, sky boxes, etc. This game development framework uses the C++ language, and you currently need Visual C++ (get a free version here). The toolkit is licensed under the GNU General Public License (GPL).
SpriteCraft Freeware 2D Game Engine Among the features of the SpritCraft 2D game engine are a high level interface for handling game objects and events, the ability to create and use tile maps and particle systems, arranging sprites into hierachies, and a script language based on JavaScript. The engine is based on COM technology, so you can interface to it from Visual Basic, Delphi, C++ and other languages that supports COM objects.
Microsoft has released the source code for Mech Commander 2 under their Shared Source licence. Note that you should read the licence to find out whether it is suitable for your purpose before using the code.
Apolyton Civilization Call to Power II (To get the source code from the above link, click the "CtP2 Source Code Project FAQ" forum post and read it to find the appropriate links.) The source code for Apolyton Civilization Call to Power 2 is available. Note that you should read the licence, which has a number of restrictions, to find out whether it is suitable for your purpose before downloading or using the source code.
Xgame - X11 Game Programming Library Xgame is a widget that allows you to create windows, read the keymap, display transparent sprites, etc, with Xlib and Xpm. It works under Linux, FreeBSD, SunOS, NetBSD, and probably others. It does not have any sound support.
The source code for the game Allegiance, a multiplayer space-combat game, is available from Microsoft Research. The website does not specify the licence under which the source code is distributed.
Pygame is a cross-platform library with a set of Python modules (see the Miscellaneous Free Compilers for links to Python) designed for writing games. It is layered on top of the Simple Directmedia Layer, or SDL (listed elsewhere on this page). Modules are provided for handling CDs, sound, the clock, fonts, joysticks, movies, drawing, events, music, the mouse, sprites, time, transformations, etc.
PPTactical is an engine for real-time strategy (RTS) and real-time tactics (RTT) games. The engine supports SDL and DirectX, has editors for maps and resources, scripted behaviour for units, battlegroups, missions, etc. Windows, Linux and Solaris are supported. It is released under the GNU Lesser General Public License (LGPL).
Golden T Game Engine is a 2D game engine written in Java. The engine supports GIF, PNG, JPG, mouse and keyboard input, MIDI, MP3, WAV, OGG, sprite management, built-in collision check, high-resolution timer, etc. It may be used in your games free of charge, provided you credit the engine's creators.
SDL - Simple Directmedia Layer SDL is a GNU LGPL multimedia library that allows your programs to use audio, the keyboard, mouse, joystick, 3D hardware (via OpenGL) and 2D video framebuffer. The site mentions that the library is used by MPEG playback software, emulators and various games. Operating systems supported include Linux, Windows, BeOS, MacOS Classic, Mac OS X, FreeBSD, OpenBSD, Solaris, IRIX and QNX. Code is also available for Windows CE, AmigaOS, Dreamcast, Atari, NetBSD, AIX, OSF/Tru64, RISC OS and Symbian OS. You can access the library with C, C++, Ada, Eiffel, Java, Lua, ML, Perl, PHP, Pike, Python, Ruby and possibly others.
This is a C/C++ game programming library for DOS, Linux, FreeBSD, Irix, Solaris, Darwin, Windows, QNX, BeOS and MacOS X. The library provides functions for graphics, sound, player input such as the keyboard, mouse and joystick, timing (high resolution interrupt timers), 3D, compressed datafiles (LZSS), floating point mathematics, GUI (file selector, dialog boxes), etc. Graphic functions include support for vector drawing, sprites, colour palettes, bitmap fonts, hardware scrolling, triple buffering, mode-X split screens, animation functions for FLI/FLC, etc. Sound functions include support for MIDI, WAV, VOC file formats, streaming audio, the ability to modify the volume, pan, pitch, etc.
QuakeII.NET is a port of the Quake II game engine to native and managed C++ under Microsoft Visual Studio .NET 2003 (note: you can find a free version of Visual Studio .NET listed on my Free C and C++ Compilers page but I'm not sure if the free version is sufficient for this port). The code has also been extended to allow the display of radar of items in the Quake world.
SCI Studio allows you to create adventure games like Sierra's King Quest, Space Quest, Police Quest, Leisure Suit Larry and Quest for Glory, using the very game engine that Sierra used for those games. The SCI game development system and the tools necessary for creating SCI games run on Windows 95, 98, NT, 2000, ME, XP and is free. The site also has documentation, tutorials, an SCI script compiler and an SCI disassembler, a demo SCI Quest game (a multiroom demo game with inventory, doors, etc), source code to SCI Studio itself, etc.
Raven Software makes the source code for Heretic and Hexen available for non-profit use.
Quake III Arena, Quake III Team Arena, Quake II, Quake Id Software makes the Quake source code available from their site, including Quake III Arena, Quake III Team Arena, Quake II (released under GNU GPL), and the original Quake (also GPL).
The Doom source code is available from Id Software for non-profit use. This source code, unfortunately for DOS users, only compiles on Linux because apparently the DOS version uses a third party sound library. Note that the above link leads to a downloadable file.
Strategus Real-Time Strategy Game Engine This real-time strategy gaming engine works across numerous platforms, including Windows, Linux, BSD, BeOS, MacOS/X, and MacOS/Darwin. It is released under the GNU GPL. It apparently has numerous features, including support for Internet play, an AI for the computer player, ability to play background music, and so on (there is no convenient list of features on their site for me to quote, at the time of this writing).
Crystal Space is an open source 3D engine licensed under the GNU LGPL and written in C++. Among its numerous features are coloured lighting, mipmapping, portals, mirrors, 3D sprites (frame based or with skeletal animation), alpha transparency, true six degrees of freedom, procedural textures, radiosity, particle systems, halos, volumetric fog, scripting, 8-bit, 16-bit and 32-bit display support, Direct3D, OpenGL, Glide and software renderer, font support, hierarchical transformations, etc. (List obtained from their website.)
PLIB is an open source (GNU LGPL) games library that features sound effects, a complete 3D engine, font-rendering, GUI, networking, 3D math library, etc, that is portable across numerous computing platforms (MacOS; Windows; Unix systems like BSD, IRIX, Solaris, OS X; etc).
This is a platform independent game development kit that handles sound, display, input, networking, files, threading, etc, allowing you to concentrate on your game proper. It is released under the GNU LGPL and is developed for Linux and Windows. It handles 2D display (has various drawing primitives like lines, pixels, rectangles, as well as image drawing like surfaces and sprites), sound support (wave, Ogg Vorbis, MikMod, etc), input support (keyboard, mouse, joysticks), network support, 3D support (OpenGL), resource management, fonts, scripting, a GUI framework, etc. DirectX, X11, DirectFB and OpenGL are supported.
Obsidian is "an open source 3D virtual world for Linux and OpenGL", providing an "extensible virtual world system with a fullblown multiplayer client-server architecture". (Information provided by the Obsidian website.) It features 3D headsup with texture mapping, TCP/IP (for operating across the Internet), a multiplayer client-server architecture, editable worlds and textures, interplayer communications, projectile weapons, etc.
Pathlib is a C library for finding optimal paths for objects in a map, timing objects and their movements, collision detection and solving of deadlocks. The library appears to be free. COLDET 3D Collision Detection Library ColDet is a free 3D collision detection library for generic polyhedra. Intended for 3D games, it is free even for commercial purposes. There are versions for use with Microsoft Visual C++, Borland C++ and Linux (g++).
This library provides a high level API for game programmers with support for graphics, devices, sound, Aritifical Inteligence (AI), real-time video, loading of graphics formats, advanced sprite management, network support, maps, etc. It is written in C and is currently developed under Linux.
This is the free 3D engine that drove Id software's famous Wolfenstein program. If you are writing game software, you probably cannot afford to ignore this.
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