Pilgway have published a first voxel SDK for their software 3D Coat. A 3B file format specification is also included.
This is simple Voxels IO SDK allows to load, save and perform simple operations over 3B files that contain voxels.
The SDK may be used to make conversion between 3B files and other formats or for batching operations over 3B files.
Multiple objects in scene are supported, too.
Pilgway: "There are no restrictions for the SDK files usage. It will be good if you will extend it by other useful examples."
Link to the forum thread: Wanna have it...