Arduino electronics simulators which can run Arduino code?

i found great 2 year old thread many suggestions best electronics simulator:

http://arduino.stackexchange.com/questions/61/can-i-program-for-arduino-without-having-a-real-board

someone said 123d circuits electronics lab versatile , looks cool, stores projects in server.

i try find electronics simulator can run arduino code , stores project in computer.

what best app that?

i used emulare can simulate 1 or many arduinos (actually, atmega328p) running arduino code own computer.  limited on simulating electronics, however.

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