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.
* 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.

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: 0.9.15 [18 Jan, 2013]
- New Features
* Linux MTP driver: Detect devices that have MTP interfaces even if their USB ids are not known
* Content server: Allow picking a random book by clicking the 'Random book' link on the start page. You can also refresh the random book page to get a new random book
* E-book viewer: Add an option to hide the toolbars in the viewer window (Preferences->Miscellaneous->Show controls in the viewr preferences). You can unhide them by right clicking in the viewer window.
* Kobo driver: Speedup initial connect by avoiding unnecessary update of series metadata in some situations.
* Get Books: Allow the store plugins to be dynamically loaded so that future website changes of a store dont require a calibre update to fix Get Books.
* Wireless driver: Always replace file when resending a previously sent book to the device, even if the title/author have changed.
* Add PocketBook Pro 912 driver.
* When creating/exporting epub and mobi files, add the calibre book identifier as a special field in the book's metadata. This allows third party tools to identify the book record in calibre to which the file belongs.
* Wireless driver: Add support for using the book uuid as the filename
* Remove the experimental tag from the subset fonts feature, since there has been only one reported problem (now fixed) with it in the two months since it was released
- Bug Fixes
* Get Books: Update the amazon, waterstones and libri.de plugins to account for website changes
* MOBI Input: Do not choke on MOBI files with incorrectly encoded titles.
* Font subsetting: Fix a bug in the parsing of the GSUB table that could cause some ligatures to not be included in the subset font
* E-book-viewer: Fix TOC links without anchors not scrolling to the top of the current flow
* LIT Input: Handle lit files that set an incorrect XML mimetype for their text.
* Catalogs: Fix 'X' being droppen from isbns on export
* Fix an error when editing date in the main book list and all visible dates are blank.
* Fix calibre-smtp using incorrect escaping for non-ascii attachment filenames
* Conversion: When subsetting fonts, handle multiple @font-face rules referring to the same physical font
* Content server: Update metadata when serving azw3 files
* CHM Input: Handle chm files that contain files with url unsafe filenames.
* Content server: Fix custom icons for top level categories incorrect.
* Kobo driver: When resending a file to the device, update the filesize in the Kobo db to prevent the device from deleting the file.
- New news sources: Asco de Vida by Krittika Goyal, Schattenblick by ThB
- Improved news sources: The Chronicle of Higher Education, Smithsonian Magazine, Philosophy Now, The Economist, Business Week Magazine