Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics

I think we see a lot of narrative tools presented as modules or splats in most AAA games. DnD's adventure books give a very distinct narrative guide, Shadowrun's lore books and Vampire's city books give a ton of narrative direction through plot hooks. This isn't feasable for indie devs, but similar could be done within a core book.