Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.

Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.

Roblox - Reimagining the way people come together.

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

Terasology - Terasology (started under the name Blockmania) is an open source project started by Benjamin...

Infiniminer - Infiniminer is a multiplayer block mining game with several different player classes to choose from.