Ninive Library is the best app for managing your library and organize your books.
It's simple, free, light, intuitive and easy to use, but with many features, all customizable.

# configuration of books' fields to display
# list of archived books
# sort books' list by title, author and rate
# free search on all book's fields
# insert, modify and delete books
# book's detail based on configured fields
# ISBN scan and data acquisition using Google Books
# rate book from 0 to 5 stars
# free setting of book's tag
# free setting of book's collection
# free setting of book's library (from 1 to 3)
# management of personal notes related to a book
# picture of book's cover, get it also by camera and gallery
# share book
# complete management of tags, with sortable list and search, detail, new, modify and delete element
# complete management of collections, with sortable list and search, detail, new, modify and delete element
# complete management of libraries, with sortable list and search, detail, new, modify and delete element
# export list of books and share it
# import a previously exported list
# share, feedback, rate
# this is not an ebook reader

Ninive Library is very simple to use; the structure and the graphic icons make Ninive Library very intuitive and easy to understanding.
It is also extremely customizable; you can choose which information about the book display and which not, including author, publisher, rating, description, price, pages, language, published date, tags, colelction, library I, library II, library III, notes and picture. ISBN and title are always visible.
The book list is compact but its graphical structure allows a quick and easy consultation; an invaluable aid is given by handy Wizard that lets you find the word you need in all book's fields.
Finally, the list is sortable by title, author and evaluation, in ascending or descending order.
The detail of the book shows the fields configured by the user and the interface is very easy to enter or edit information.
In Ninive Library of great comfort is the book's search with ISBN barcode scanner: the informations are acquired thanks to Google Books and the user can complete the informations with its own notes and assessments.
The book can be associated with tags, collections and libraries.
The picture of book's cover, which is acquired by Google or selected from the gallery, completes the book's details.
The book archived is later editable in all its parts and can be deleted.
Finally you can share the single book with your contacts.

With Ninive Library you can completely manage tags, collections and libraries to bind books.
The useful free search allows you to find the word in the description of the tag, collection or library.
The list is ordered by description, in ascending or descending order.
New and detail form allows you to specify the description of the item.
The element archived is later editable and can be deleted.

Ninive Library allows all data export, books, tags, collections and libraries in order to share data or to use data as backup.
Import operation allows to replace the current data with those of a previous export.
The operations are useful if you need to exchange data from one phone to another or between friends.

Screenshots: 

Video: