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.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).
You'll be told of any plugin you may be required to download to make it work.
calls between Skype users are free) and you can make paid audio calls to landlines if you so choose.
More » Google Hangouts is great for many reasons, one being that most everyone can login right away, given that they have a Gmail account.
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.
More » ) is a video calling app for Linux and Windows computers.