See plugin repository for more information.
Some of the KiCad demo boards:
Big complex boards:
- motherboard from c4puter on github
- frankenso from rusefi
- Imx6 openRex KiCad port from jasuramme
And couple of in house designs:
- HP34401a DMM OLED mod [kicad files]
- OSPx201
- Keithley 1950 option board - showcases support for extra fields.