Circuito.io - Instant code and wiring for your project
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
B4R - Development tool for native Arduino programs.
SimPhy - Interactive 2D & 3D Physics simulation software
embedXcode - embedXcode is a template for Xcode.
Physion - Physics Simulation Sandbox