Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Unity - The multiplatform game creation tools for everyone.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Blender - Blender is the open source, cross platform suite of tools for 3D creation.