Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Autodesk 3DS Max - 3ds Max is software for 3D modeling, animation, rendering, and visualization. Create stunning game enrivonments, design visualizations, and virtual reality experiences.
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
ZBrush - ZBrush is a digital sculpting and painting software solution.