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 Сalibre 1.0.0 [23.08.13]
- New Features
* A new 'cover grid' view of the books in your calibre library
* Excellent for judging your books by their covers To use click the button with the icon of a grid in the bottom right corner of the main window. It can be configured via Preferences->Look & Feel->Cover Grid
* A new, faster database backend
* The database backend in calibre has been re-written from scratch. The new code is smaller, more robust and much faster than the old code. The exact speedup will depend on the number of books and number and type of custom columns in your library. Users have reported calibre startup times decreasing by a factor of 2-3 times.
* For a summary of the major changes in calibre between 0.9 and 1.0
calibre has reached 1.0, seven years after it was first released and a year since the last major release. Lots of new features have been added to calibre in the last year — a grid view of book covers, a new, faster database backend, the ability to convert Microsoft Word files, tools to make changes to ebooks without needing to do a full conversion, full support for font embedding and subsetting, and many more, described in detail see http://calibre-ebook.com/new-in/ten
* RTF Input: Add option to ignore WMF images iinstead of replacing them with a placeholder.
* Content server: Make virtual libraries available as searches from the start page. They work just like saved searches, clicking on a virtual library will show you all the books in that virtual library.
- Bug Fixes
* Remove extra, useless 'language' entry in metadata download configuration dialog
* Kobo driver: Display device collections even if the driver is configured to not manage shelves on the device.
* Fix typo in calibre.desktop file on linux
* Edit metadata dialog: Disable OK button while results are being downloaded.
* In OS X 10.8 Apple stopped redirecting stdout/stderr to Console.app for applications launched by launch services. Re-enable the redirection, useful for debugging.
* Fix virtual library tabs not being updated when using VL button
- New news sources: News24 and Nuus24 by Nicki de Wet,
- Improved news sources: Consumerist, jeuxvideo, Metro UK, El Tribuno, High Country News, Daily Express, Providence Journal, mediapart