WALTR - Drag-and-drop any media file to an iOS device (without iTunes) for native playback.
Spotify - Map shows when two people play same song at same time
PhoneView - With PhoneView, you can view, save and print all of your iPhone and iPad messages, WhatsApp messages, voicemail and other data directly on your Mac. Save your SMS, iMessages and WhatsApp messages.
SoundCloud - Enjoy music & follow favourite artists
iCopyBot iPod to Computer Transfer - iPod to Computer Transfer - Get music off iPod and transfer to PC or Mac Computer, Copy songs, video, photos, playlists back to iTunes.
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