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Thermite is a voxel-based 3D game engine primarily designed as a show case for PolyVox technology. It integrates PolyVox technology with various other components in order to produce highly dynamic game environments which can be easily modified in real time. It is released as open source software under the terms of the ZLib License. Note that ModDB lists it as BSD license, but that is only because it doesn't have ZLib as an option.
A variety of images from the Thermite3D tech demo, showing the realtime editing in action.