I've started a Franky Mode 4 Development page. Its main goal is to encourage new developments for Franky Mode 4 rather than just conversions of existing Sega Master System titles. It contains tools to convert SC5 pictures to Mode 4 tiles. Future releases will most likely include tools like tile and sprite pattern editors and editors for the name table and sprite attribute tables that will use Franky to display the result on. The site will also contain a list of links to third party tools (these may be running on systems other than MSX) that can be used to create tilesets and sprites for new developments.