Product Haunt - Browse the Product Hunt graveyard 👻
Magic Playlist - Get the playlist of your dreams based on a song
Whystle - Get an alert when products you use are recalled.
Spotalike - Spotify playlist with similar songs, according to Last.fm
Product Hunt Real or Fake - Guess which products are real and which are jokes
Playlist Machinery - Tools that help you create & organize your Spotify playlists