Simulator for Arduino

Simulator for Arduino screenshots

Simulator for Arduino is the most full featured Arduino Simulator available
Main Window
Simulator for Arduino 0.99 : Main Window

Alternative downloads

ROBOTC for Arduino
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It is a robotic programming language for educational robotics and competitions.
Brain Block's 3D Mars Spirit Rover Simulator
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This is a 3D simulation of the Mars surface exploration done by Spirit robot.
VC CamHack Fr
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Great tool which allows you to change the views in VC.