Electronic circuit simulator that runs in the browser. This app lets you simulate the behavior of arbitrary electrical circuits.
I have not actually used this, But I love you for making this. I will use it later today though! <3
http://ulmdevice.altervista.org/
https://www.circuitlab.com/
Smart Apps
http://easyeda.com/
https://www.tinacloud.com/
http://www.tinacloud.com/
http://www.espruino.com/
http://fiddlesalad.com/
http://fiddlesalad.com/