Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Lidarr - Lidarr is a music collection manager for downloading and organizing music libraries.
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
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.
TIDAL - Tidal is a streaming music service supported by some of the most influential artists working in the industry.
MP3base - MP3box - free mp3 search and download, stream music online for free, play tons of artists, albums and songs without registration.