Quorus - A new way to listen to music through collaboration
Plexamp - A small music player with a number of unique features
musiqpad - Musiqpad is a social-music software platform for users to host their own ‘pads’ (rooms).
Vinyls - Vinyls is a music player that lets you listen to your music without any complicated setup.
ReverbNation Discover - Stream hand-picked, ad free music from emerging artists.
Poolside FM for iPhone - A pool party in your pocket