C'mon. It's Skype. Even if your business can't take advantage of free Skype-to-Skype calling, the service offers plenty of other productivity-boosting features. The Skype app dishes out systemwide notifications and can be docked to one side of the screen. The Microsoft-owned service sinks its hooks deeply into Windows 8's native People app.
Frequent travelers might be able save some coin by using Skype's sister app, the free Skype Wi-Fi, which lets you tap in to the Net at more than 1 million hotspots around the globe—assuming you have some Skype credit in the bank, of course.