Actually Iceball would be the way to go there for further dev: https://github.com/iamgreaser/iceball Oh, and I was wondering, I mentioned some tools for making voxel models, but I don't know if Terasology supports any of the formats used (would be nice to for simple easy voxel models): http://www.reddit.com/r/iceball/comments/2y9v42/iceball_what_it_is_and_how_you_can_help/ I've wanted to try Trove, but it doesn't work through Wine (Linux). There is the C-programmed voxel engine Craft (ridiculously they don't want to pick a new name) which I've found very efficient, although there wasn't anybody else online to test it with and nothing moves so far (even no liquids): http://www.michaelfogleman.com/craft/ Now, as for a game I would really want a free open-source clone of, it's CubeWorld ( https://picroma.com/ ). I mean just from the looks, it's pretty much converting all your favorite 80s-90s pixel games into voxels, which I think could work out great, and there's already the pixel art out there to do it! Maybe a tool to directly sculpt a cube-shaped mass right out of a pixel model would be great (literally just matching size, position, and color of pixels). The thing is, I don't know what's happening to Cube World, https://en.wikipedia.org/wiki/Cube_World . I'm sure everyone has doubts it'll show up this decade, especially with just 2 devs (really 1 coder, 1 artist, neither good at handling DoS attacks).