Magic Playlist - Get the playlist of your dreams based on a song
Modern CSV - A CSV editor/viewer
Spotalike - Spotify playlist with similar songs, according to Last.fm
ReCsvEditor - Csv / Tsv / Delimited file editor. Supports for very large Files.
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Rons CSV Editor - Rons CSV Editor / Now Rons Data Edit