calibre is an e-book library manager. It can view, convert and catalog e-books \
in most of the major e-book formats. It can also talk to e-book reader \
devices. It can go out to the internet and fetch metadata for your books. \
It can download newspapers and convert them into e-books for convenient \
reading. It is cross platform, running on Linux, Windows and OS X.

For screenshots: https://calibre.kovidgoyal.net/wiki/Screenshots

For installation/usage instructions please see
http://calibre.kovidgoyal.net

For source code access:
bzr branch lp:calibre

To update your copy of the source code:
bzr merge

Tarballs of the source code for each release are now available \
at http://code.google.com/p/calibre-ebook