None. Maybe humanism and secularism combined can be called a spiritual system? I mean I like to think of a higher purpose in being a good human, and your influence can live on down through generations by the works you do as a good human. Most of us won't ever be great humans, but we can all be good humans. I think modern takes on “spiritualism” are bogus and likely no better than what has come before considering the overwhelming failure of organized religions to better the human condition.