Scribd Audiobooks - Unlimited access to 30,000 audiobooks
Magic Playlist - Get the playlist of your dreams based on a song
BookPlayer - Player for your DRM-free audiobooks. Contribute to TortugaPower/BookPlayer development by creating an account on GitHub.
Spotalike - Spotify playlist with similar songs, according to Last.fm
Channels by Audible - Follow handcrafted interest-based playlists.
Playlist Machinery - Tools that help you create & organize your Spotify playlists