I am an audiobook addict that coded this https://github.com/cpttripzz/Chatterblez. I am using it all the time and it works nice. I have only bothered to get it working on windows but it should be cross-platform as it uses pyqt, I would be happy for contributors to help get it working on macos and linux and also ATI and other video cards.If you are stuck without a video card I recommend using https://github.com/cpttripzz/audiblez it can generate an audiobook in around 4 hours with a decent CPU