SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Magic Playlist - Get the playlist of your dreams based on a song
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Spotalike - Spotify playlist with similar songs, according to Last.fm
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Playlist Machinery - Tools that help you create & organize your Spotify playlists