iTunes
Unveiled: 2001
iTunes caught on with the digital music revolution that exploded in part because of the free music sharing tool Napster. But when Napster ceased being the free go-to site for music, iTunes slowly took over the pay-for-music realm on the Web when the iTunes store opened in 2003. In addition to integrating with the emerging portable mp3 player market at the time, iTunes provided an easy way to manage, purchase, and burn digital music to CD. iTunes has since expanded to manage video, audio books, and more digital content.