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: 0.9.23 [15 Mar, 2013]
- New Features
* New tool: "Edit ToC" that allows you to edit or create a Table of Contents easily in EPUB or AZW3 ebooks.
Using the Edit ToC tool, you can easily re-arrange the entries in an existing Table of Contents, change their text and even change the location they point to by simply clicking the new location in the book. To use this tool, go to Preferences->Toolbar and add the Edit ToC tool to the main toolbar. Then simply select the books you want to be polished and click the Edit ToC button. This tool is based on a new codebase, so there may be bugs.
* Content server: Enable use of plugboards for mobi and azw3 formats
* Windows driver for Tolino Shine
* When copying books to another library, show the name of the destination library in the copy dialog
* Allow running plugins from the command line with calibre-debug easily
- Bug Fixes
* PDF Output: Fix bug causing left and right margins to be applied to the cover page. Also fix the preserve cover aspect ratio option not working correctly
* PDF Output: Fix javascript dialog box popping up in the middle on converting very long documents.
* MOBI metadata: When setting the language in a MOBI file also update the language field in the EXTH header.
* MOBI metadata: Support writing of book producer field into MOBI files.
* Fix job progress and status not always updated
* Fix conversion of zip.rar archives with very long title/author on windows
* News download: Update the library used to parse RSS feeds.
* Fix Irex Illiad not recognized on OS X computers
* Fix entering a very long search in the find item in tag browser box causes the tag browser to no longer be shrinkable.
* Fix a bug in the zsh completion when converting for ebook-convert with PDF output
- New news sources: Deccan Herald by Muruli Shamanna, What If by kisnick, The Friday Times by Unknown, Computer Woche by Maria Seliger, Lamebook by atordo
- Improved news sources: Various Polish news sources, Harpers Full, kath.net, Smithsonian