VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Audioship - Upload audio to YouTube or Facebook
PRIZM - Intelligent music player that you can plug into any speakers
Move to Apple Music - Convert your Spotify playlists for Apple Music
Tycho Forecast - Turn your weather into a Spotify or Apple Music playlist
podsync - Simple and free service that lets you listen to any YouTube or Vimeo channels, playlists or user videos in podcast format