Alternative apps to TrueCraft:
Minecraft is a fun sandbox game where you explore lost worlds, kill monsters and uncover secrets. Download for Windows, Mac and Linux. This is the World of Color Update.
Minetest is an infinite-world block sandbox game and a game engine, inspired by InfiniMiner, Minecraft and the like. It has been in development and use since October 2010.
Battlefield meets Minecraft. FPS shooter with online multiplayer action in a sandbox world.