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[333 users on Ohloh]
Blender is a 3D animation and compositing suite with tools for modeling (advanced subdivision modeling, multiresolution sculpting), uv unwrapping, texturing (procedural node, 2D and 3D painting), animation, rendering, particles and simulation (including fluid dynamics, hard body physics, cloth and hair), post-production with node based compositing and non linear editing, integrated game engine (with graphical programming, vehicle and rag doll constraints) and python scripting including an impor...
Simple DirectMedia Layer
[136 users on Ohloh]
A cross-platform multimedia library designed to provide low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D video framebuffer.

SDL supports Linux, Windows, Windows CE, BeOS, MacOS, Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX. The code contains unofficial support for AmigaOS, Dreamcast, Atari, AIX, OSF/Tru64, RISC OS, SymbianOS, and OS/2.

SDL is written in C, but works with C++ natively, and has bindings to several other language...

[94 users on Ohloh]
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 abstracts all the details of using the underlying system libraries like Direct3D and OpenGL and provides an interface based on world objects.
[92 users on Ohloh]
Mesa is an open-source implementation of the OpenGL specification - a system for rendering interactive 3D graphics.

A variety of device drivers allows Mesa to be used in many different environments ranging from software emulation to complete hardware acceleration for modern GPUs.

Mesa ties into several other open-source projects: the Direct Rendering Infrastructure and X.org to provide OpenGL support to users of X on Linux, FreeBSD and other operating systems.

Compiz Fusion
[72 users on Ohloh]
Compiz Fusion is the result of a merge between the well-known Beryl composite window manager and Compiz Extras, a community set of improvements to the Compiz composite window manager. Compiz Fusion aims to provide an easy and fun-to-use windowed environment, allowing use of the graphics hardware to render each individual window and the entire screen, to provide some impressive effects, speed and usefulness.
[48 users on Ohloh]
Pygame is a set of Python modules designed for writing games. It is written on top of the excellent SDL library. This allows you to create fully featured games and multimedia programs in the python language. Pygame is highly portable and runs on nearly every platform and operating system.
[45 users on Ohloh]
Celestia is an OpenGL-based 3D space simulation for Unix and Win32 that lets you travel through the solar system, to the stars, and even beyond the galaxy. Visit over 100,000 stars, 100 solar system bodies, and all known extrasolar planets.
eZ Components
[44 users on Ohloh]
eZ components is an enterprise ready general purpose PHP components library by eZ systems. As a collection of high quality independent building blocks for PHP application development eZ components will both speed up development and reduce risks.

An application can use one or more components effortlessly as they all adhere to the same naming conventions and follow the same structure.

[43 users on Ohloh]
OpenAL is a cross-platform 3D audio API appropriate for use with gaming applications and many other types of audio applications.
[43 users on Ohloh]
Stellarium renders 3D photo-realistic skies in real time with OpenGL. It displays stars, constellations, planets and nebulae, and has many other features including multiple panoramic landscapes, fog, light pollution simulation and a built-in scripting engine.

Stellarium comes with a star catalogue of about 600 thousand stars and it is possible to download extra catalogues with up to 210 million stars.

Stellarium has multiple sky cultures - see the constellations from the traditions o...

[38 users on Ohloh]
jMonkeyEngine provides a high performance, scenegraph based rendering and physics system.
Crystal Space 3D
[38 users on Ohloh]
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 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.
[38 users on Ohloh]
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 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.
BZFlag - Multiplayer 3D Tank Game
[37 users on Ohloh]
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.
[31 users on Ohloh]
Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS.
UFO: Alien Invasion
[30 users on Ohloh]
UFO: Alien Invasion is a strategy game featuring tactical combat against hostile alien forces which are about to infiltrate earth at this very moment. You are in command of a small special unit which has been founded to face the alien strike force. To be successful on the long run, you will also have to have a research team study the aliens and their technologies in order to learn as much as possible about their technology, their goals and the aliens themselves.
[27 users on Ohloh]
Hugin is a toolkit for stitching photographs and assembling panoramas, together with an easy to use graphical front end.
Second Life Viewer
[27 users on Ohloh]
Second Life is a 3-D virtual world entirely built and owned by its residents. Since opening to the public in 2003, it has grown explosively and today is inhabited by a total of 6,642,422 people from around the globe.

Linden Lab is making the source code for the Second Life Viewer available to everyone. Talented developers from around the world will be able to collaborate with Linden Lab to refine and enhance the experience for all residents of Second Life.

Crazy Eddies GUI System
[25 users on Ohloh]
A free library providing windowing and widgets for graphics APIs / engines where such functionality is not natively available, or severely lacking. The library is object orientated, written in C++, and targeted at games developers who should be spending their time creating great games, not building GUI sub-systems!
[25 users on Ohloh]
Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS. These structures provide many functions, the most important being spawning. The designated builders must ensure there are spawn structures or other players will not be able to rejoin the game after death. Other structures provide automated base defense (to some degree)...