A new demonstration of the Linderdaum Engine, an open source C++ 3D gaming engine targeted to interactive 3d applications such as game, industrial, and scientific visualization uses, showcases the new Volume Rendering support.  What makes this one unique is that the GPU accelerated volume rendering support works on all AMD Radeon cards from the 3450 and higher.

In addition to this, the engine has support for the usual features such as per-pixel shaders, bumpmaps, and various occlusion algorithms.

Linderdaum Engine.