Skype – The world’s most popular VoIP client in the world. This application is used by almost half of the world, many use it for work, while others use it to communicate with family and friends. To say exactly one thing is possible – this application is the best and recognized in the world, besides you can make calls not only to this application, but also to ordinary numbers in other countries. To replenish the account is as simple, through the official website of the developer. Communicate with your family and friends around the world.