Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Gravity Sketch for iPad - Easy 3D sketching for design and ideation
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Nexto - Replace boring audio guides with games & puzzles
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Vectary - Vectary is a free, online 3D modeling tool and sharing platform.