Fritzing is an ultimate tool for document the Arduino-based prototype and create a PCB layout for manufacturing. Similar to Arduino, Fritzing is also an open-source project. There are tons of electrical components library predefined for you or you can create some yourself. It supports breadboard, schematic and PCB views.

Fritzing Arduino Breadboard View

Fritzing Arduino Schematic View
Fritzing is a powerful Arduino prototyping software but it is not a Arduino board software simulator.
Latest version of Fritzing can be downloaded from Fritzing Official Website.
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