Magic Playlist - Get the playlist of your dreams based on a song
Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.
Playlist Machinery - Tools that help you create & organize your Spotify playlists
LibriVox - free public domain audiobooks
Spotify.me - Beautiful analytics on your Spotify listening habits 🎧
LearnOutLoud.com - LearnOutLoud.com is the web's largest resource for audio & video learning.