*[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
*[[CPC_GX4000-Multi_EPROM_Cartridge|Multi-EPROM cartridge]] for CPC+/GX4000
*[https://github.com/etomuc/gx4000-multi-cartridge GX4000 multi cartridge[Multi Cartridge 8 ROMs]] by ETO - , for up to 8 cartridge romsGX4000 / Amstrad Plus
*[[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] [https://youtu.be/UDaw-nd4L9c Youtube] Amstrad CPC+ GX4000 reflashable cartridge