kicad_pcb - SERP Analysis

https://www.kicad.org/

https://dev-docs.kicad.org/en/file-formats/sexpr-pcb/index.html

https://forum.kicad.info/t/is-there-a-good-resource-with-example-kicad-pcb-files/30378

https://www.reddit.com/r/ErgoMechKeyboards/comments/zr5uq9/how_do_i_create_a_3d_printable_file_from_a_kicad/

https://cho45.stfuawsc.com/kicad-utils/static/viewer.html

https://forum.digikey.com/t/dkred-kicad-9-kicad-pcb-file-support/54063

https://file.org/extension/kicad_pcb

https://forum.kicad.info/t/dxf-exporter-for-mechanical-layers-of-kicad-pcb-board/2885

https://forum.digikey.com/t/continual-upload-failures-of-kicad-pcb-files/36581