LogicCircuit is my personal favorite digital logic sim tool. You can build reusable components with custom inputs/outputs: https://www.logiccircuit.org/ https:

LogicCircuit is my personal favorite digital logic sim tool. You can build reusable components with custom inputs/outputs: https://www.logiccircuit.org/ https://www.logiccircuit.org/ Also worth mentioning NandGame: https://nandgame.com/ https://nandgame.com/