Books stores, sorts, and searches a "virtual card catalog" for a personal library. Books makes it simple to enter new books, edit the information of older books, and sort the books by attributes such as title and author. Books also includes built-in searching for quick book information retrieval and XML support for importing and exporting collection information in HTML and XML. All original code written for the Books project is made available under the MIT License. The PDF and J2ME plugins use libraries licensed under the Apache license and the Sun Community Source Licence.