This FREE program can convert ebooks into other formats. i.e. from Kindle (mobi file) to pub (Sony reader) format and so on. It's simple to use and a small donation wouldn't go a miss although the software is FREE (I only say this as I did make a donation because there are a load of free ebooks out there that need converting). Please note that I did find this was slow to respond at times but the program will download. Works with Windows, OS X and Linux (Just click on which os you have) There is also a demo video.