Do you use Viber on your smartphone? How about using it on your desktop too?
Viber is a great alternative to Whatsapp on your Smartphone, plus Viber folks are very concerned about integrating your application with the Desktop, nothing cool than sending and receiving messages right from your computer either.
The application has compatibility with Windows, Mac OSX and of course Linux (Ubuntu / Debian / Mint) in 64-bit versions.
To download the program to your system just access this link and click "Get Viber" on the green button, download the file and double click to install.