On Github, user SukkoPera hosts a re-creation of the Amiga 500+ motherboard.
Link to Github project:
https://github.com/SukkoPera/Raemixx500
Tags / Projects:
Raemixx500 (Rämixx500) Open Hardware (OH) remake of the Commodore Amiga 500+ mainboard, revision 8A.1
OpenFlops OH Floppy Disk Drive emulator. Runs FlashFloppy firmware.
OpenAmiga600RamExpansion OH 1
MB Chip RAM Expansion for the Amiga 600 with RTC
OpenAmiga600FastRamExpansion OH 4
MB Fast RAM Expansion for the Amiga 600
OpenAmiga500FastRamExpansion OH 4/8
MB Fast RAM Expansion for the Amiga 500
OpenKickstartSwitcher OH Kickstart Switcher for Amiga Computers