Songstack - Swipe to discover new music for Spotify
remixmonsta - Tired of Despacito? Find a cool remix instead
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
mixmello - mixmello is a free, open source tool to create remixed versions of your favourite playlists.
YouTube Ads - Video advertising on YouTube works, and you only pay when people watch your video ads. Get started with online video advertising campaigns today.
Music Walker - Explore and play (via YouTube) songs similar to a seed song.