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: 0.9.43 [09.08.13]
- New Features
* TXT Input: Allow using various markdown extensions for more features when converting markdown formatted txt files.
* Sending by email: Allow sending by email to an arbitrary combination of email address. Access it via the 'Select recipients' menu entry in the Email To menu.
* A new 'Sort By' action for the right click menu. This allows sorting on all columns in the library, not just the visible columns. To use it go to Preferences->Toolbars and add it to 'The context menu for books in the calibre library'
* Allow adding images into the comments field, by clicking on the insert link button in the comments editor in the edit metadata dialog.
* Allow skipping the confirm bulk reconvert dialog
* EPUB Input: If the EPUB file identifies an actual cover image in addition to the titlepage html file, use the cover image instead of rendering the titlepage. This is faster and has the advantage that an EPUB to EPUB conversion preserves internal cover structure.
* Get Books: Improve searching by removing punctuation from title/authors before matching.
- Bug Fixes
* Conversion: Fix empty inline tags that are the second child of a paragraph causing text change location.
* Fix book count in tooltip of choose library button not updating
* Kobo driver: When deleting shelves that have been synced, the Activity entry for the shelf was not being deleted. This left a tile for the shelf on the home screen of the Glo and AuraHD.
* Comments editor: The Insert Link button has no effect until the user clicks inside the comments box, therefore disable it until it is ready, to prevent confusion.
* Get Books: Update various Polish store plugins
- New news sources: Various French news sources by Malah, La Capital de Rosario by Darko Miletic, Jot Down by desUbiKado, Private Eye by Martyn Pritchard
- Improved news sources: The Sunday Times UK and The Times Online, Telegraph UK, Le Monde: Edition abonnes, The Scotsman