ScrumbleShip - It's got voxels, heat simulation, kilometer long spaceships, real world materials, organic ships, and awesome music. Eventually, it's going to have AI crew, multiplayer, inertia, planets, and more.
This really is a major release, packing in so many new features and fixes!
The two main major features added:
Ships can now move!
Added transparency for blocks (and they twinkle), so you can now actually make windows
Should work better on open source drivers
Along with the two major features there have been masses of fixes, new rendering engines and much more!