KiCad boards from 24 GitHub repositories tagged “c64”, the most starred first; open any of them in PCBKit.
LouDnl/USBSID-Pico
USBSID-Pico is a RPi Pico (RP2040/W RP2350/W) based board for interfacing one or two MOS SID chips and/or hardware SID emulators over (WEB)USB with your computer, phone, ASID supporting player or USB midi controller
screwbreaker/ScartPCB
A little PCB to buld a SCART cable for console and old computers
tebl/C64-PlayOnTape
It's a tapuino, mostly because I wanted to build one. Uses an Arduino to load tapes on the good old Commodore 64.
venice1200/MiSTer_SNAC2IEC
Commodore/CBM IEC Adapter for MiSTer FPGA
jsanpe/SwinsidNeat
Yet another PCB layout of the nano SwinSID focusing on aesthetics
hackup/C64ExpansionBreakout
Breakout Board for the Expansion Port of the C64
tebl/BulkyModem
My significantly more expensive, slightly less capable version of the Zimodem-hardware. Surfing the BBS-world at a blazing 1200 baud (or faster)!
detlefgerhardt/TapecartFlasher
Windows/Arduino tool for writing and reading C64 Tapecart modules
pmandes/C64-RF-Modulator
Commodore C64C RF modulator replacement with S-Video and stereo audio output.
jsanpe/ZaxCart
A kicad implementation of a C64 cartridge with potential to be used as a Super Zaxxon compatible cart
RetroNynjah/82S100-PLA-replacement
ATF1502 based PLA replacement
benmcevoy/xbox360-c64
XBox 360 controller (and PS4, Nintendo, etc) working on a real commodore C64
mark-akturatech/vic-20-rom-replacement-pcb
PCB for Vic20 Basic/Kernal ROM replacement with single Eprom
mamejay/C64-USB-C-PD-Power-Adapter
USB-C PD power adapter for the Commodore 64 (KiCad, JLCPCB-ready)