AzuraCast - AzuraCast is a free and open-source self-hosted "web radio station in a box".
Spotify - Map shows when two people play same song at same time
Centova Cast - Centova Cast is the world's most advanced Internet radio stream hosting control panel.
SoundCloud - Enjoy music & follow favourite artists
SAM Broadcaster - SAM Broadcaster is a professional computer-based internet radio broadcasting solution.
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