BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
Heartbeat - Listen to music with your friends together, on Spotify
Twinjack - Stream Spotify music with anyone with just a link
Liyo - Stream your favorite music live with friends 🎶
Parallel - Listen to music with friends over Spotify at the same time
üWave - üWave is a self-hosted collaborative listening platform.