Skype is the most popular app for voice and video calling.In the mobile market, Skype has since long been dethroned by Whats App and Viber, but it still remains the most prominent tool for free communication on computers.One neat feature when doing that is that you can see which of your contacts are using Facetime (you can't call someone unless they're also signed up for Facetime).More » Another similar way to make free HD video calls from your computer is with Nimbuzz.However, if you do have a Mac, i Phone, or i Pod touch, you can easily make video or audio calls from the device, almost in the exact same way you would make a regular phone call.Similar to Google Hangouts, Facetime lets you search through your phone's contacts to find someone to call.Note: Go to the Facebook Help Center if you need help using Facebook's video chat feature through or the mobile Messenger app.More » on Apple's operating system and devices, and only to other Facetime users.
You'll be told of any plugin you may be required to download to make it work.It works on Windows and Mac computers but also mobile devices like Black Berry, i OS, Android, Nokia, and Kindle.You can also join chat rooms, send stickers, make audio only calls, and set up group chats.So long as both users are using the oo Voo app, they can make video calls as often as they like, for Voo was created in 2007 and works with a range of other platforms like Windows Phone and even inside web browsers.More » If you have a Windows computer, Viber might be the perfect free video calling app for you.