Calibre is a free and open source e-book library management application developed by users of e-books for users of e-books.
Now more and more fans reading books on portable mobile devices, which have already been set. E-books come about in 4312 formats. But for smart phones, mobile phones and other portable devices require their own formats and different too. Today, these formats: AZW Amazon, MOBI MobiPocket, LIT Microsoft, Palm PNPd eReader, BBeB Sony, Epub, etc. Here, you will help the program Calibre

It has a cornucopia of features divided into the following main categories:
Library Management
* Calibre manages your e-book collection for you. It is designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.
* Virtual Libraries: Easily partition your large calibre library into smaller 'virtual' libraries
* Calibre can sort the books in your library by: Title, Author, Date added, Date published, Size, Rating, Series, etc.
* In addition, it supports extra searchable metadata:
* o Tags: A flexible system for categorizing your collection however you like
* o Comments: A long form entry that you can use for book description, notes, reviews, etc.
* You can easily search your book collection for a particular book. calibre supports searching any and all of the fields mentioned above. You can construct advanced search queries by clicking the helpful "Advanced search" button to the left of the search bar.
* You can export arbitrary subsets of your collection to your hard disk arranged in a fully customizable folder structure.
* Finally, calibre will even go out onto the internet to find book metadata based on existing title/author or ISBN information. It can download various types of metadata and covers for your books, automatically. The metadata system is written using plugins so that different types of metadata sources can be supported in the future.

Tools:
* "Edit ToC" that allows you to edit or create a Table of Contents easily in EPUB or AZW3 ebooks.
* "Polish books" that allows you to perform various automated cleanup actions on EPUB and AZW3 files without doing a full conversion.

E-book conversion
* Calibre can convert from a huge number of formats to a huge number of formats. It supports all the major e-book formats. The full list of formats can be found here.
Input Formats: CBZ, CBR, CBC, CHM, DJVU, EPUB, FB2, HTML, HTMLZ, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, SNB, TCR, TXT, TXTZ
Output Formats: AZW3, EPUB, FB2, OEB, LIT, LRF, MOBI, HTMLZ, PDB, PML, RB, PDF, RTF, SNB, TCR, TXT, TXTZ
* The conversion engine has lots of powerful features. It can rescale all font sizes, ensuring the output e-book is readable no matter what font sizes the input document uses. It can automatically detect/create book structure, like chapters and Table of Contents. It can insert the book metadata into a "Book Jacket" at the start of the book.

Syncing to e-book reader devices
* Calibre has a modular device driver design that makes adding support for different e-reader devices easy. At the moment, it has support for a large number of devices, the complete list of which is here.
* Syncing supports updating metadata on the device from metadata in the library and creation of collections on the device based on the tags defined in the library.
* If a book has more than one format available, calibre automatically chooses the best format when uploading to the device. If none of the formats is suitable, calibre will automatically convert the e-book to a format suitable for the device before sending it.

Downloading news from the web and converting it into e-book form
Calibre can automatically fetch news from websites or RSS feeds, format the news into a ebook and upload to a connected device. The ebooks include the full versions of the articles, not just the summaries. Examples of supported news sites include: The New York Times, The Wall Street Journal, The Economist, Time, Newsweek, The Guardian, ESPN, and many, many more…

Calibre has over three hundred news sources and the news system is plugin based, allowing users to easily create and contribute new sources to calibre. As a result the collection of news sources keeps on growing!

Upgrading
If you want to upgrade a previous version of calibre portable, download the latest version of the installer from here and run it, choosing the location of your previous Calibre Portable install. The installer will automatically update Calibre Portable.

Release: 0.9.35 [14 Jun, 2013]
- New Features
* News download: Add a framework for scraping javascript heavy sites using a full WebKit browser. Used by the new recipe for time.com
* DOCX Input: Add a markup analyzer that identifies and removes redundant markup generated by Word. This can result in much cleaner HTML and reductions in markup size of up to 50%
* DOCX Input: Add support for theme fonts
* calibredb list: Add an option to limit the number of results
* Get Books: Allow stopping an in progress search. While doing a search, the Search button becomes a Stop button, and clicking on it stops the current search.
* When viewing the list of jobs in calibre, display the time at which the job was started.
* Conversion settings: When selecting the input/output profiles, show the profile screen size along with its description.
- Bug Fixes
* Get Books: Fix searching using the title/author being case-sensitive and therefore sometimes not returning results if uppercase characters were used in the query.
* EPUB/AZW3 Output: When splitting HTML on page breaks, preserve tag structure in the split files. This fixes splitting losing some styling information for HTML files that define page breaks on deeply nested tags.
* DOCX Input: Fix some manual page breaks being ignored
* DOCX Input: Fix empty paragraphs not being rendered
* DOCX Input: Fix some text being underlined incorrectly. The 'none' underline style was being translated incorrectly.
* E-book viewer: When viewing EPUB files, ignore any encoding declarations in the HTML and assume that the HTML is encoded in UTF-8, unless decoding with UTF-8 fails. This is what the EPUB specification specifies.
* AZW3 Output: Fix a typo that could prevent conversion of some files
* calibredb list: When outputting data in columns, handle multibyte and east asian characters correctly.
* Get Books: Fix unable to change case of words in the title/author/keywords boxes because of completion.
* Fix unable to clear custom date columns using the bulk metadata edit dialog
* MOBI Output: Fix regression that breaks conversion of some documents
- New news sources: Neu Osnabrucker Zeitung by Krittika Goyal
- Improved news sources: La Nacion, Frontline, New York Time Sports Beat, Time, Times of India, Las Vegas Review Journal, Folha de Sao Paolo