Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Roblox - Reimagining the way people come together.
HiberWorld - HiberWorld is a website that allows you to make and play 3D levels for speedrunning
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
KoGaMa - Kogama is a Massively Multiplayer Online, Sandbox, City-Building and Adventure-based video game.
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.