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: 0.9.27 [12 Apr, 2013]
- New Features
* Metadata download: Add two new sources for covers: Google Image Search and bigbooksearch.com.
(To enable them go to Preferences->Metadata download and enable the 'Google Image' and 'Big Book Search' sources. Google Images is useful for finding larger covers as well as alternate versions of the cover. Big Book Search searches for alternate covers from amazon.com. It can occasionally find nicer covers than the direct Amazon source. Note that both these sources download multiple covers for a single book. Some of these covers can be wrong (i.e. they may be of a different book or not covers at all, so you should inspect the results and manually pick the best match). When bulk downloading, these sources are only used if the other sources find no covers.)
* Content server: Allow specifying a reestriction to use for the server when embedding it as a WSGI app.
* Get Books: Add a plugin for the Koobe Polish book store
* calibredb add_format: Add an option to not replace existing formats. Also pep8 compliance.
* Allow restoring of the ORIGINAL_XXX format by right-clicking it in the book details panel
- Bug Fixes
* AZW3 Input: Do not fail to identify JPEG images with 8BIM headers created with Adobe Photoshop.
* Amazon metadata download: Ignore Spanish edition entries when searching for a book on amazon.com
* TXT Input: When converting a txt file with a Byte Order Mark, remove the Byte Order Mark before further processing as it can cause the first line of the text to be mis-interpreted.
* Get Books: Fix searching for current book/title/author by right clicking the get books icon
* Get Books: Update nexto, gutenberg, and virtualo store plugins for website changes
* Amazon metadata download: When downloading from amazon.co.jp handle the 'Black curtain redirect' for adult titles.
* When extracting zip files do not allow maliciously created zip files to overwrite other files on the system
* RTF Input: Handle RTF files with invalid border style specifications
- New news sources: Economia by Manish Bhattarai, Universe Today by seird, The Galaxy's Edge by Krittika Goyal
- Improved news sources: The Escapist, San Francisco Chronicle, The Onion, Fronda, Tom's Hardware,New Yorker, Financial Times UK, Business Week Magazine, Victoria Times, tvxs, The Independent