FaceTime is quite the hit on iOS devices, because it allows you to perform free video calls to iOS devices and to Max OS X. However, only problem with FaceTime is that you cannot use it with your PC, but luckily, there’s an alternative for FaceTime called Nimbuzz.
Nimbuzz is designed for iOS devices and Windows computers, and with Nimbuzz you’ll be able to perform video calls from iOS device to iOS device, iOS to PC, and PC to iOS over 3G and WiFi. In addition to regular video calls, you’ll be able to perform video calls without audio, so users will be able to see each other even on the networks that have restricted VoIP services.
Nimbuzz is a good alternative to FaceTime, and according to the developer, Nimbuzz is coming to Android and Symbian platforms in the future, but currently, you can download Nimbuzz from App Store or from Nimbuzz website.