Remathilis
Legend
I'm not sure that needs a moniker that separates it from D&D though. Most everyone agrees that WotC stuff has a different tone than say, Darrington or Ghostfire. I assumed it was projects like Doctors and Daleks that don't use anything resembling the PHB (or deviation thereof).It doesn't have to be purist. It just has to be basically 5e, but not following all the playstyle and content dictates that WotC follows. A lot of 3pp, nearly all of it, already does that.