A free program for Android, by SKOOB.
Skoob - Para quem ama livros is a great reading app that is not an e-book reader. It is designed to make life easier for those who enjoy reading. With this app, you can organize all your books, from the ones you have to the ones you want to read, in a virtual library.
With this, you will be able to do:
Make notes and keep track of the books you are reading. Add tags, favorites, and ratings. Find all the books you have read and those you want to read. Create a library. Share your books with friends. Participate in challenges and ranking among your friends.