I'm looking at doing a small electronic project several times in my boat. I've got the project up and running on a small solderless breadboard, so I know the circuit / software (there is an Arduino knock-off here) works, My soldering skills leave enough to be desired that so far my efforts to get a solder based protoboard up and running ... have not gone so well. So, as I am going to need several of these, and I know I can solder printed circuit boards, I am wondering if I shouldn't just use the services of one of the China based firms that do small runs of custom printed circuit boards for little money (firms like (but not necessarily) PCBWay)? Of course to make that happen I will need computer aided design (CAD) software to generate the files needed by the firm in China to manufacture. So, CAD software for electronics work that runs under Linux, is available under the GPL, what is available? I have looked at KiCad, but are there better options out there? Also, looking for learning the software in question, are there any good YouTube tutorial videos? Thanks.