MusicTwin Finder - Find your MusicTwin by your Spotify playlists in 5 seconds.
Songlink - Share music with anyone.
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
aux.app - A free web-based music platform to play music from other popular online streaming services.