Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Clonk Rage - Real-time multiplayer game. Players can download more than 47475 maps at ccan.de
Roblox - Reimagining the way people come together.
Gnomescroll - Gnomescroll is a multiplayer survival RPG in surreal environments.
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Blocks That Matter - Blocks That Matter (BTM) is a 2D indie puzzle platformer.