The author of Little John, the NES/SNES emulator, is planning on making a Dreamcast port. Here’s what he has to say:

It’s true I want to port LJNG on Dreamcast. But I have just restarted working on it after a big break of 6 months. Currently I am reorganizing the sources to make less SDL dependant and to implement a gbc emu core. There are some pbs with snes9x license… I have some exams so I will post the new sources and binaries for linux and win32 later. Expect a release at the end of March or beginning of April. The DC port should follow as soon as I can get it work (not tried for now). I have a DC and the coders cable so it shouldn’t be too hard.

He is also interested in help from anyone serious and knowledgable to help with the port. You can contact him here.