Minetest

Minetest is a near infinite world block sandbox game and a game engine, inspired by InfiniMiner, Minecraft and the like.

Features:

* Explore, dig and build in a voxel world, and craft stuff from raw materials to help you along the way. * Play with your friends on public servers or self hosted servers * Easy plugin based Modding API used to add blocks, tools and features to the game. * Voxel based lighting with gameplay consequences (light caves and buildings with torches) * Almost infinite world and several beautiful map generators. * Runs natively on Windows, Linux, OS X, FreeBSD and Android * Supports multiple languages, translated by the community. * A constant development to add new functionalities for end-users * Open Source