Spotify releases the source code of its Winamp clone
spotiamb.com
2 threads
I don't read anything in that page that says this is a Spotify product... It even says: "Spotiamb is not an officially supported product of Spotify®."
The source code (linked from that page) is at https://github.com/spotify/spotiamb and the license says copyright Spotify (https://github.com/spotify/spotiamb/blob/master/LICENSE), so it seems that it was at least made by Spotify engineers, even if it's not "officially supported".
BitDefender blocks this site because of "Malware site".