TubeLister - Generate a YouTube playlist from your opened tabs.
PeekaBeat - Turn your selfie into Spotify playlist 🎶
DiskyT - Youtube playlists done right
Playlist Machinery - Tools that help you create & organize your Spotify playlists
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
Lazyset - A Spotify playlist mixing Facebook Messenger bot