Is there any add on by which PDFs / documents can be shared easily ? The PDF can be easily categorized, rated with stars etc. More like shop with every stuff is free If there are no such plugins, then, I'd like to create one for me : I have a forum related to books & reading. I'd like to have a download section where books can be shared easily. Only public domain books & no piracy. I will just share direct download links of FeedBooks or Gutenberg [if that is illegal, then I will host them on my server]. It must be easy for admins to add books. For example, feedbooks urls are like this : Directs to page : http://www.feedbooks.com/book/1 now append .jpg, we get a cover : http://www.feedbooks.com/book/1.jpg appending epub, mobi or pdf gives download link : http://www.feedbooks.com/book/1.pdf OR the official resource manager can be used for this ?