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• ngspice vs Qucs-SQucs-S adds graphical schematic entry on top of SPICE engines including Ngspice, is open source under GPL-2.0, and runs on Windows, macOS and Linux.
• ngspice vs LTspiceLTspice is a free but closed-source SPICE simulator from Analog Devices with built-in schematic capture and a waveform viewer, and it runs on Windows only.
• ngspice vs Proteus Design SuiteProteus Design Suite simulates circuits and microcontroller firmware with graphical schematic capture and PCB layout, but it is commercial, closed source and runs only on Windows.