is a free cross-platform software that works on Windows, macOS, and Linux. KiCAD combines three things, a Schematic editor, PCB editor, and 3-D viewer to create schematics, design PCB circuits ...

That’s the reason for the vast versions of SPICE available now decades after the original was released, not all of which are as open or free as we might like. Qucs is a GPL circuit simulator.

This stemmed from a review of a friend’s circuit design that used the UART in the project, but also called for an FTDI chip in order to reprogram via USB and a bootloader. Unlike the schematic ...