Rough out a model with simple 3D shapes, turn it into voxels with one click, then paint it, split it into parts and export it for your game. You don't need to jump between a modeller and a voxel editor.
Most voxel editors make you build every model a voxel at a time. Getting the proportions right before any detail goes in means either a lot of patience or a round trip through a separate 3D package.
Brut3D puts both halves in one app. You block out the form with real 3D tools, voxelize it, then switch straight to painting and detailing. When it's done, it exports in the format your game engine already reads.
Brut3D is in active development. Leave your email to hear when the first build is ready to try.