RR-Net
From vesalia.de
Network Card for MMC Replay, Retro Replay / MMC64 and Chameleon
The networking card RR-Net is the perfect expansion for the MMC Replay, Retro Replay / MMC64 and Chameleon (this is the second, revised version of RR-NET, designed to fit into a cartridge shell together with the MMC Replay or Chameleon cartridge).
RR-Net is plugged to the expansion port of the MMC Replay, Retro Replay or MMC64 and allows connecting the C64 to an intranet via the software package Contiki. Contiki is an operating system that offers many features in very small space: A TCP/IP stack, a web browser, a webserver, a VNC-client and of course a graphical user interface.
The really interesting stuff however is software like Http-Load or WarpCopy64, allowing you the fast transfer of programs or disk images via Ethernet from your PC.