Audiobookbuilder is nice, but commercial and only available on MacOS... Another open source alternative is Audiobook Binder (http://bluezbox.com/audiobookbinder

Audiobookbuilder is nice, but commercial and only available on MacOS... Another open source alternative is Audiobook Binder (http://bluezbox.com/audiobookbinder.html http://bluezbox.com/audiobookbinder.html) - which is good and also comes with a command line utility, but it hat some GUI issues and is only available for MacOS. Another german project for Windows is http://www.audiobookcreator.de/ http://www.audiobookcreator.de/, which works, but it also did not fit my needs - i prefer auto command line merge instead of manual GUI interaction