Currently Linux version is in development, and only they offer client for 64-bit systems. With Viber users can also make HD calls to any Viber users on Android, iPhone, Windows Phone, Windows, Mac, BlackBerry, iOS, Linux and many more over using 3G/ 4G or WIFI connections. Viber is very much similar to Skype in letting you to make free video/ voice calls, send free text/ video messages, photo sharing, group conversations, sync contacts, share location with one-anther. The Viber was firstly released for smartphones later they have made client available for Windows and Mac desktop operating systems including Linux. Viber is a user-friendly cross-platform Voice over Internet Protocol ( VoIP) instant messaging and video calling application for smartphones created by Viber Media.