Just ask what you are looking for in Fan Fiction in FanFic Alley. There are lots of great stories in there.
If you are looking for copyrighted books, I am sorry but we do not allow them on the site. We have a Bookstore Cafe where you can chat about books and an author's section which has specials from author like their book is free on Amazon today.
There are games also and a tech section so take a good look around. There is lots to do.