Pushbullet - Pushbullet - Your devices working better together
Spotify - Map shows when two people play same song at same time
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
SoundCloud - Enjoy music & follow favourite artists
Gotify - a simple self-hosted server for sending and receiving messages
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm