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OpenArena is a 3d game creation engine. It is a rendering system that can be used for more than just games but it is targeted at games. The basic use being create some game media textures models maps and config files for physics and rules.
PHIGS is an API standard for rendering 3D computer graphics. During the 1990's OpenGL became a more popular 3D API for professionals, and it still is today. PHIGS remains to be widely used in the film industry.
Open PHIGS uses OpenGL for rendering graphics rather than implementing it's own abstraction layer to the graphics hardware, or using the PHIGS Extension to X (PEX). The reason for doing so is that today every graphics card manufacturer provides their own OpenGL implementation,...
xizero is a 3d enhanced vertical scroller/shooter. It will run under linux and possibly windows and is a complete software renderer. More at: http://atcrosslevel.de
Terrain Voyager Engine is an OpenGL accelerated, multi-platform (Win32, Linux, IRIX) landscape engine. One of the goal of it is to make a small FPS game.
A Free General 3D Graphics API for use in 3D Game/Visualization Projects. Fully C++ Class based API, support for OpenGL hardware acceleration and other optimization methods like Octrees. Cube Mapping, Multitexturing and more. Direct loading of (View3DS)