Wacht.tv - Reddit meets MTV, discover music videos!
Shazam - Shazam is a mobile app that recognizes music and TV around you.
spool.tv - Just music videos.
Acclaimed Music - Acclaimed music is a top music recommendation tool that showcases the most popular song based on which is currently topping the Billboard charts and provides links to the latest music news.
Kaizen - Kaizen is an ElasticSearch GUI for Windows, Mac and Linux, written in JavaFX as a cross-platform desktop application.
Spotify - Map shows when two people play same song at same time