Whether you’re an eBook aficionado, an aspiring writer, or ar just trying to get a handle on all of your eBooks across all of your devices the open-source Calibre program is your solution. You can manage your library, sync your files to virtually every device you’ve got, and even convert eBook formats.
Calibre is free to download for Windows, Mac OS X and Linux systems. You can get it HERE.
While relatively glacial in pushing updates, Kovid Goyal has now updated this excellent program twice in a month!
About
Calibre started life on 31 October, 2006, soon after the release of the SONY PRS-500, the first e-ink based reader to be sold commercially in the US. At the time, I was a graduate student, with a lot of time on my hands. The PRS-500 did not work at all with Linux, my operating system of choice, so I decided to reverse engineer the USB protocol that it used, to get it working on Linux. This was accomplished with the help of the fine folks over at mobileread.com and calibre was born, albeit named libprs500.