polyvox.pngPolyVox is (according to its developers admittedly) "a fast, lightweight C++ library for the storage and processing of volumetric (voxel-based) environments" that can be used for anything from games to scientific applications. What's more, PolyVox is both free to grab and use even in commercial software, and also handily open-sourced under the zlib license. Oh, and it looks rather powerful and beautiful indeed, though I can't really say much more; my C++ skills are below average and with said average being already abysmal I wouldn't know how to use the thing. A proper programmer would though...