Magic Playlist - Get the playlist of your dreams based on a song
NOISESUPPLY - Pandora for SoundCloud
Spotalike - Spotify playlist with similar songs, according to Last.fm
Tuned Rocks📺 - Discover🔎 curated Youtube videos 24/7
Playlist Machinery - Tools that help you create & organize your Spotify playlists
TubeLister - Generate a YouTube playlist from your opened tabs.