>>1This engine doesn't do anything new, it is an interesting application of well known techniques. It should be quite feasible to take a free voxel engine like Minetest and modify it to perform the same way as this engine. Minetest already has its own procedural terrain generation so it shouldn't be hard to repurpose those algorithms to recreate the Voxel Quest terrain engine. Minetest doesn't have procedural building generation but that shouldn't be hard to accomplish. I'm sure there are free software procedural algorithms for buildings for Minecraft (though I haven't actually looked for one); even if there wasn't a free one, procedural buildings shouldn't be hard to write.