Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
The Blockheads - Night is falling and your blockhead is freezing.
SimPhy - Interactive 2D & 3D Physics simulation software
Clonk Rage - Real-time multiplayer game. Players can download more than 47475 maps at ccan.de
Physion - Physics Simulation Sandbox
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.