Songlink - Share music with anyone.
MusicTwin Finder - Find your MusicTwin by your Spotify playlists in 5 seconds.
Son.gg in Slack - Share music with your team in Slack
SoundCloud Charts - The most played tracks on SoundCloud this week
humit - A social networking app for music sharing and discovery.
Playlist Machinery - Tools that help you create & organize your Spotify playlists