Songstack - Swipe to discover new music for Spotify
Tempso - Finally a place for classical music online!
Gnoosic - Even if you don't know what you are looking for - gnod will find it.
Concertmaster - Classical music front-end for Spotify
mixmello - mixmello is a free, open source tool to create remixed versions of your favourite playlists.
Classical - A classical music interface for Apple Music