I consider TFM Module Maker and the VGM version the best FM trackers for music for the Sega Megadrive / Genesis. I don't mind at all about the cessation of development. In terms of simplicity, user interface and usable features there is nothing as good. It is very quick and easy to learn to use and allows a lot of experimentation with parameters to create new sounds. It even allows export of the data so you can play your music on the real hardware, without a computer; this is something that GenMDM can't do as it relies on computer control via MIDI. GenMDM is for realtime whereas with TFMMM you can make tunes that you can share with others who can then play them on their hardware.
So thank you for your work Shiru, very much appreciated! You have my respect.