Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Roblox - Reimagining the way people come together.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Unity - The multiplatform game creation tools for everyone.
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Project Anarchy - Project Anarchy is a complete end to end game engine and state-of-the-art toolset for mobile.