Real Time Electronic Circuit Simulator.
Include PIC, AVR and Arduino simulation.
AVR simulation provide by simavr: https://github.com/buserror/simavr
PIC simulation provided by GpSim: http://gpsim.sourceforge.net/
I like what I see but as soon as I tried to create a circuit I realised so many components are absent. I noticed that all the ones I wanted were on the list of items intended for the current version. Transistor, Mosfet and voltage regulator. I guess it's back to the breadboard for me.