Booksonic allows you to stream your audiobooks to your phone wherever you are, perfect on boring bus rides or during the training session.
Booksonic is a Subsonic app but it has a couple of features that are unique for it when compared to other Subsonic apps.
These are things like
Book descriptions, either you add your own to the server or the app will try and look it up online.
Author, narrator and book length are displayed on the book view.
Sleep timer, to reset the countdown just shake the phone.
Tracks are marked as heard so you know what you have listened to.
Import/Export server details and heard status
Support for almost all audio formats
More will be added as I think of them.
Other features include:
Variable playback speed (Marshmallow+)
Multiple themes to choose from
Browse by tags or by folder structure
Wear Support (Lolipop+)
And a lot more.
These are part of the app Booksonic is based on, it's called DSub. If you are intending to use the app for music then you should go for DSub instead or use both because essential music features (like shuffle) has been removed from Booksonic.
Booksonic will work with any server that is based on Subsonic but to get the most out of it your server need to use the Booksonic Server. You can get the server for free at http://booksonic.org
Both the app and the server are released under GPLv3.