Youtube Music, Spotify, Deezer, Apple Music, SoundCloud, Psst, Bandcamp, Spotube, foobar2000, Rhythmbox, Spotify-qt, nuclear, Clementine, Strawberry, Dopamine, Youtube Music (th-ch), Jetispot, Hyperpipe, Yandex Music, Olivia, SpotX, AbleMusic, Alfred Spotify Mini Player, SpotSpot are some alternatives to Moosync.