There's also at least one other drag-and-drop Nand2Tetris-compatible simulator out there, Andrew Wilkes' desktop-based LogicSimX/Logic Simulator 2 https://logic

There's also at least one other drag-and-drop Nand2Tetris-compatible simulator out there, Andrew Wilkes' desktop-based LogicSimX/Logic Simulator 2 https://logicsimx.com/about/ https://logicsimx.com/about/ https://andrew-wilkes.itch.io/logic-simulator-2 https://andrew-wilkes.itch.io/logic-simulator-2 . It seems nice but I don't know enough to review it properly.