calibre is a feature-rich e-book library management application with a variety of useful functions including viewer, editor, online book and news search/download, device-specific e-book conversion, batch metadata tools, and content server for online access to your collection.
The program syncs automatically with many different physical devices. It supports a variety of ebook and document formats.
Cross-platform with clients available for Mac and Linux. Alternatively, Calibre Portable and X-calibre, as well as a WinXP-compatible version are also available.
