The Voxtrot app is a new player in the free calls industry and they promise to get a lot of attention for how they have thought about the user experience. The app integrates into your phone without needing to add any contacts, unlike its main competitor, Skype.
What does this mean? Next time you are in a WiFi zone and you want to make a free long distance call, your Voxtrot app will search your contact instead of needing to manually enter the info into the app.
The Voxtrot app is ingenious in how it anticipates how it is going to be used and in what context -- and it delivers a great solution to a common annoyance. The Voxtrot app is currently in Beta.