Voreen 2.5: OpenGL Volume Rendering Engine
Voreen is an open source volume rendering engine which allows interactive visualization of volumetric data sets with high flexibility when integrating new visualization techniques. It is implemented as a multi-platform (Windows, Linux, Mac) C++ library using OpenGL and GLSL for GPU-based rendering.
You can grab binaries and source code HERE.
Quick test of the fancy.vws project
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