Martin Vilcans is in the process of updating Screenplain to use SPMD. You can give it a test run here. Try feeding it this sample file, or make your own. Any text file that contains anything remotely like a screenplay should work well.
This is a very early work in progress without any real utility yet—the only output is a simple “look, it works” page—but it’s still exciting to see. There’s no forced line break support yet, nor any text emphasis, but he does have dual dialog working.
Martin is not the only developer to express interest in SPMD, but he’s the first to show progress. Nice work Martin, can’t wait to see more!