Skype is a text, voice, and video-chatting platform that works using your Internet connection. Skype has branched off from a desktop software solution to work in mobile phones and household phones that just need a Wi-Fi or Internet connection to run. Like instant-messaging clients, Skype gives users a buddy list instead of a set of phone numbers.
Over the years, Skype has also introduced a number of new features. One of the more interesting ones is SkypeOut, a service that lets Skype users call outside numbers, both long distance and international. There's also SkypePrime, a service that lets users create their own pay-by-the-minute lines for expert advice or consulting services.
Winner: Skype (Skype.com)