Lidarr - Lidarr is a music collection manager for downloading and organizing music libraries.
Spotify - Map shows when two people play same song at same time
Headphones - Automatic music downloader for SABnzbd. Headphones is an automated music downloader for NZB and Torrent, written in Python. It supports SABnzbd, NZBget, Transmission, µTorrent, Deluge and Blackhole.
SoundCloud - Enjoy music & follow favourite artists
Lacey - Free Music & Video Downloader
Ampache - Web ( HTTP centralized ) based audio/video streaming application