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Qt is a cross-platform (Windows, Unix, MacOs X) graphical toolkit.
Qt features a rich API to write GUI software, but also for other aspect of application development : network classes, xml, internationalisation, database, ...
Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer. It is used by MPEG playback software, emulators, and many
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popular games, including the award winning Linux port of "Civilization: Call To Power."
SDL supports Linux, Windows, Windows CE, BeOS, MacOS, Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX. The code contains support for AmigaOS, Dreamcast, Atari, AIX, OSF/Tru64, RISC OS, SymbianOS, and OS/2, but these are not officially supported.
SDL is written in C, but works with C++ natively, and has bindings to several other languages, including Ada, C#, Eiffel, Erlang, Euphoria, Guile, Haskell, Java, Lisp, Lua, ML, Objective C, Pascal, P [Less]
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 applications utilizing hardware-accelerated 3D graphics. The class library
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abstracts all the details of using the underlying system libraries like Direct3D and OpenGL and provides an interface based on world objects. [Less]
Crystal Space is a free, cross-platform software development kit for realtime 3D graphics.
It supports Windows, Linux, MaxOS/X and more. Though written in C++, other languages like Python can also be used to write programs.
Based on a plugin
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system it's very modular and extended easily.
3D rendering is done with OpenGL. Features of the latest as well as older hardware are supported seamlessly. [Less]
jMonkeyEngine provides a high performance, scenegraph based rendering and physics system.
BZFlag is a 3D, multiplayer, tank battle zone, capture the flag game that pits players against each other in a networked environment. It runs on Windows 95/98/NT/2000, Linux, MacOS 10.x, Irix, Solaris, and others. An OpenGL accelerator is highly recommended, but it is playable with 3D in software.
Nexuiz is a fast-paced, chaotic, and intense multiplayer first-person shooter game, focused on providing basic, old style deathmatch. It is extremely modder-friendly. Nexuiz is built on the power of the Darkplaces engine, which is a heavily modified
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version of the original Quake. Darkplaces features realtime lighting and stencil shadows, bumpmapping, gloss, bloom, and totally rewritten network code that supports up to 64 players on a single server. [Less]
XBMC is a multimedia player/jukebox for the Xbox from Microsoft. It can be used to play or view most common video, audio, and picture formats such as MPEG-1/2/4, DivX, XviD, MP3, AAC, JPG, and GIF directly from a CD or DVD in the Xbox DVD-ROM drive
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or from the Xbox hard drive. XBMC can also stream files over a local network or from the Internet. Playlist and slideshow functions, a weather forecast, and many audio visualizations are also included. [Less]
Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS.
The Lightweight Java Game Library (LWJGL) is a solution aimed directly at professional and amateur Java programmers alike to enable commercial quality games to be written in Java. LWJGL provides developers access to high performance crossplatform
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libraries such as OpenGL (Open Graphics Library) and OpenAL (Open Audio Library) allowing for state of the art 3D games and 3D sound. Additionally LWJGL provides access to controllers such as Gamepads, Steering wheel and Joysticks. All in a simple and straight forward API. [Less]
Crystal Entity Layer is a layer that sits on top of Crystal Space 3D Engine. It provides the notion of entities and property classes. As such it will make it easier to make games using Crystal Space.
The OpenSceneGraph is an open source high performance 3D graphics toolkit, used by application developers in fields such as visual simulation, games, virtual reality, scientific visualization and modelling. Written entirely in Standard C++ and OpenGL
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it runs on all Windows platforms, OSX, GNU/Linux, IRIX, Solaris, HP-Ux, AIX and FreeBSD operating systems. [Less]
Warzone 2100 was one of the first 3D RTS games ever. It was released commercially by Pumpkin Studies in 1999, and released in 2004 under the GPL. The Warzone Resurrection project wishes to make Warzone 2100 one of top free software games available.
The Outcast is an alternative client for MMORPG called Tibia. This is the 2D version of the client.
FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit for UNIX/Linux (X11), Microsoft Windows, and Mac OS X. It provides modern GUI functionality without the bloat, and supports 3D graphics via OpenGL and its built-in GLUT emulation. FLTK
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is designed to be small and modular enough to be statically linked, and also works fine as a shared library. It also includes an excellent UI builder called FLUID that can be used to create applications in minutes. [Less]
Scorched3D is a cross-platform 3D remake of the popular 2D artillery game Scorched Earth. Scorched3D can be played against the computer, other players, and remotely across the Internet or LAN.
The Irrlicht Engine is a high performance real-time 3D engine written and usable in C++, and also available for .NET languages. It is completely cross-platform, using D3D, OpenGL, and its own software renderers.
The Xith3d project consists of powerful middleware consisting of a scenegraph and an extensible renderer. The goal is to create a lean and performative scenegraph and renderer while at the same time allowing for extensions and enchancements to all
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stages of the rendering pipeline.
You can think of it as a 3D engine. It allows to create games, or any application requiring a 3D visualization. It's versatile, usable with JOGL or LWJGL, embeddable in AWT, Swing, SWT (Eclipse).
It has support for physics engine (JOODE), and many development facilities.
It's fast and easy-to-use. [Less]
XBMC media center is a free cross-platform media-player jukebox and entertainment hub. XBMC is open source (GPL) software available for Linux, Mac OS X, Microsoft Windows operating-system, and the Xbox game-console. XBMC can play a very complete
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spectrum of of multimedia formats, and featuring playlist, audio visualizations, slideshow, and weather forecast functions, together with a multitude of third-party plugins. [Less]
The Axiom Engine Project is a fully object oriented game engine development effort using C# and the Microsoft.Net or Mono platform to create an easy to use, flexible, extendable, and powerful engine that allows for rapid development of games for various genres.
VDrift is a cross-platform, open source driving simulation made with drift racing in mind. It's powered by the excellent Vamos physics engine. It is released under the GNU General Public License (GPL) v2. It is currently available for Linux, FreeBSD, Mac OS X and Windows (Cygwin).
Warsow is a standalone, eSports-oriented FPS game. It is based on Qfusion, an advanced modification of the Quake 2 engine. It features fast-paced gameplay focused on trix (trick jumps) and art of movement. War§ow features a complete power-up system
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, including weak and strong fire mode for each weapon in all "normal" gametypes as well as Warshell (battle shield) and Warshock (quad damage) for team-based gametypes. Its cartoonish graphics use cel shading with a style that is similar but not identical to Manga. [Less]
Thousand Parsec is not only a game by itself, it is also a framework for creating a similar group of turn-based space empire building games, which are often called 4X games, from the main phases found in them: eXplore, eXpand, eXploit and
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eXterminate. Some examples of games which Thousand Parsec draws ideas from are Stars!, VGA Planets, Reach for the Stars, Master of Orion and Galactic Civilizations.
The idea is that a protocol is specified which defines how game servers and game clients communicate with each other. Protocol also specifies which objects are available for custom games or rulesets, which can have different rules of gamplay. Any client should be able to connect with any server and player should be able to play any game with it. [Less]
S.C.O.U.R.G.E. is a Rogue-like game with a modern user interface. The game allows a group of four characters to search for treasure, kill enemies, gain levels, etc.
PySoy is a cross-platform Python module which enables developers to easily build custom Python-based 3D games.
The engine features integrated physics, Ogg multimedia support, advanced rendering options such as bumpmap textures, and an optimized
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C-based rendering system for high framerates.
The purpose of the PySoy project is to enable more people to develop "commercial quality" copyleft games. [Less]
FreeOrion, an open-source game inspired by Master of Orion, is a turn-based game of epic space strategy that builds on the classic '4X' model by incorporating the nation-building elements of games such as Europa Universalis 2 and a versatile tactical
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combat engine. While its modular, open-source design allows for a significant degree of customization of the game engine and the story elements by the community, the FreeOrion team is dedicated to the construction of a living, breathing universe in a 'grand campaign' model. [Less]
Vega Strike is a cross-platform space flight simulation game. Inspired by the gameplay of classics such as Wing Commander: Privateer, Vega Strike features an open-ended universe in which players can trade, fight, and explore. Players can also take
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missions, and maintain relations with the three races and various factions of the game. Recent development versions include experimental netplay.
There are also a number of mod projects in development, including mods for Wing Commander, Star Trek, Elite, and several original universes. [Less]
Crystal Core is a single player shooter with puzzle elements and a strong story. It is based on a science fiction setting. The game is Open Source and serves as an important tutorial on how to use Crystal Space and Crystal Entity Layer.
Frets on Fire is an excellent opensource clone of Guitar Hero for Windows, Linux, and OSX. It can import songs from a Guitar Hero I or II disc, can play user-created songs, or lets you to create your own songs with its song editor. For hardcore
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players, your results are automatically posted to the World Charts on the website, so that you can see how awesome you are. (Written in Python using bindings to many fast C libraries.) [Less]
AssaultCube, formerly ActionCube, is a free first-person-shooter based on the game Cube. Set in a realistic looking environment, as far as that´s possible with this engine, while gameplay stays fast and arcade. This game is all about team oriented multiplayer fun.