*[https://github.com/f1ac0/CPC-plus-cartridge CPC-plus-cartridge] Different PCB designs and code to make a CPC-plus cartridge
*[https://github.com/zeus074/Amstrad_Multicart Amstrad Multicart] 16-in-1 cartridge for the GX4000 or Amstrad Plus computer
*[https://cpcrulez.fr/hardware-interface_ROM-gx4000_homebrew_player.htm GX4000 Homebrew Player] [https://cpcrulez.fr/hardware-interface_ROM-gx4000_homebrew_player-32_in_one.htm CPC+ 32-in-one multigames] by Retroelectronik
*[[C4CPC]] Cartridge replacement for the Amstrad Plus range and the GX4000
*[https://overange.weebly.com/amstrad-gx4000-cpc-464-6128-plus-reflashable-flash-cartridge.html Flash+ cartridge] Amstrad CPC+ GX4000 reflashable cartridge