Calibre

Calibre. It is a free and open-source cross-platform software application suite for e-book management, developed by programmer Kovid Goyal. The software provides comprehensive tools for organizing, converting, syncing, and reading digital publications across major operating systems. Its extensive feature set and active development community have established it as a leading tool in the digital library ecosystem.

Overview

The primary function of the software is to serve as a complete e-book library manager, acting as a central hub for a user's digital book collection. It integrates a powerful database for cataloging titles with metadata fetched from sources like Amazon, Google Books, and other online repositories. Beyond management, it includes a built-in e-book viewer, a news aggregator for downloading periodicals, and a content server for remote access to libraries. The application is widely used by owners of dedicated e-reader devices such as those from Kindle, Kobo, and Nook, as well as by users of general-purpose tablets and computers.

Features

Key capabilities include robust metadata editing, allowing users to modify details like author, title, and ISBN for any book in the library. Its conversion engine supports transforming publications between numerous e-book formats while preserving formatting, complex layouts, and table of contents structures. The software features a rule-based tagging and organization system, advanced search functions, and plugin architecture for extending functionality. Additional tools encompass e-book editing, DRM management for personal backups, and the ability to fetch news from websites like The New York Times or The Guardian and compile them into e-book formats.

History

The project was initiated in 2006 by Kovid Goyal to address the need for a unified management tool for the then-emerging e-reader market. The first public version was released on October 31, 2006. Its development accelerated with the rising popularity of the Amazon Kindle after 2007, as users sought software to manage content not solely within Amazon's ecosystem. Major milestones include the introduction of the content server feature, integration with the Open Publication Distribution System (OPDS), and continuous refinement of its conversion tools to handle formats from Adobe and Apple. The project has remained under the stewardship of Goyal, with funding primarily from user donations.

Supported formats

The application supports a vast array of input and output formats for both conversion and reading. For input, it natively handles popular formats including EPUB, MOBI, AZW, PDF, DOCX, and HTML. Its output conversion can generate EPUB, AZW3, MOBI, PDF, DOCX, and plain text files, among others. The integrated viewer can directly render EPUB, AZW, AZW3, CBZ, and CBR files. This extensive format support ensures compatibility with devices from Sony, PocketBook, and Onyx Boox, as well as software like Adobe Digital Editions and Apple Books.

Development and community

Development is led by Kovid Goyal and a team of contributors, with the source code hosted on platforms like GitHub. The project is licensed under the GNU General Public License, ensuring its free and open-source nature. A large, international user community contributes through forums, bug reporting, translation efforts, and the creation of plugins that add support for new devices or services. The software is regularly updated, with new releases frequently adding features such as improved typography handling, enhanced syncing with cloud storage services, and support for the latest e-reader models from companies like Amazon and Kobo.

Category:Free software programmed in Python Category:E-book software Category:Digital library software Category:Cross-platform software