Luanti

Luanti is a voxel-based game platform with multiplayer capabilities. The objective of the available games varies, from sandbox games where you can explore, dig and build in a very large voxel world, to arcade-style games. There is a wide range of built-in map generators for procedurally generated terrain, and voxel-based lighting that adapts to the environment and light sources. All games and mods are written in Lua with a scripting API that is easy to use and makes it easy for modders to get started.