Join My Playlist - Listen to music live together with your friends in Spotify.
TubeLister - Generate a YouTube playlist from your opened tabs.
Parallel - Listen to music with friends over Spotify at the same time
DiskyT - Youtube playlists done right
TuneMeet - Chat with people who are listening to the same song
Tuned Rocks📺 - Discover🔎 curated Youtube videos 24/7