A circuit designer using breadboards, ICs, resistors, and LEDs. Written in Java, not only can you design the circuit, but you can simulate the inputs and watch the outputs as well.
Open the BreadboardCircuitDesigner directory under src in Netbeans to view the code.
$ cd src/BreadboardCircuitDesigner/dist
$ java -jar BreadboardCircuitDesigner.jar
The application is licensed under the MIT License. Copyright © Akash Nag.