Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
MagicaVoxel - A free lightweight GPU-based voxel art editor and interactive path tracing renderer.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Goxel - Goxel is a simple, but powerful voxel graphic editor with 24-bit color support, unlimited scene...
Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Cubik Studio - Model in a unique cubic style. Start modelization with boxes. Move, rotate and scale cuboids.