Take the 2-minute tour ×  I need a free web application in order
to organize a local book library. I mean paper books, not
e-books. We used YouTrack for that purpose before, but it
doesn't fit our needs because:    1. Free version allows only
limited numbers of users to be registered.   2. We had to
dedicate a server in order to host the application.   3. We had
to think of backups and other technical stuff.  How the process
was organized:  An issue in YouTrack represents a book. Issue
creator is an owner of that book; anyone who takes a book from
the library assigns that book/issue to herself. In description
we put some book summary.  Physically, all books are stored on a
bookshelf at work.  I hope you got the idea.  So, the
requirements are:    1. The application should be free.   2. It
should be web-based (like Google Docs).   3. Number of user
accounts should be not less than, say, 500.   4. We want to
restrict unregistered users from modifying any book.   5. We
want be able to comment/like each book.  Go