QuakeIIxp is a multi-platform (windows, linux and freeBSD (experemental)) graphics port of the game Quake II developed by Id Software. Completely updated rendering takes full advantage of the latest graphics cards to get the perfect picture, preserving the original style of the game.
RadDoom is a radiosity scene renderer that use "Dynamic Surface Subdivision". It's write in Java and Java3D. It enables, in real time, the user to travel in the 3D scene during rendering.
LightStorm is a photorealistic multi-processor 3D rendering engine written in C/C++ that goes one step beyond Radiosity without the need for ray-tracing tecniques.
Mythox Rendering System is an open source photorealistic renderer employing radiosity, ray tracing, photon mapping, BSSRDF and will support
Max, Maya as a plugin. It will run under both Windows and *NIX.
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RadGL is an OpenSource 3D-engine for Win32 platform using OpenGL API. RadGL supports static Radiosity lighting, dynamic lighting and shadows, etc. The project is still mostly under specification
zRcube aims to be a powerful renderer : we plan to use both radiosity and raytracing (at the same time) algorithms to provide photorealistic pictures. It runs on clusters and uses the pov format.