calibre - Ebook manager, viewer & converter
Soundiiz - Transferring playlists between various music streaming platforms.
tinyMediaManager - A multi OS media manager written in Java/Swing
Tune My Music - Transfer Playlists Between Music Services
Delicious Library - Delicious Library 3: Catalog your books, movies, music, software, toys, tools, electronics, & video games. Archive your life.
FreeYourMusic - Migrate from and to any music services