These types of stories, with the 'hero monsters' are a relatively new invention, with more cases occurring in best sellers than in movies (although the ideas are then copied endlessly afterwards). But, due to that relationship, I doubt there's a lot of zombie-werewolf-vampire-post-apocalyptic stories to be found, at least on SOL. However, I'd imagine there's any number of them on Switch's favorite site, which focuses on young-adult amateur fiction. (I'd include a reference link, but I can't remember the name of the site offhand).