Tox

What is Tox? Tox is a skype replacement, with downloads available for Linux/Mac/Windows. At the time of this post, there are no 32bit downloads. as per the Tox Binaries page

Project Tox, also known as Tox, is a FOSS (Free and Open Source Software) instant messaging application aimed to replace Skype.

Why does Tox exist?

With the rise of governmental monitoring programs, Tox aims to be an easy to use, all-in-one communication platform (including audio, and videochats in the future) that ensures their users full privacy and secure message delivery.

About Tox

Tox is built with the idea that you can keep up with friends and family without having your privacy violated. While other big-name services require you to pay to unlock features, Tox is free in both price, and in liberty. That is, you’re free to do whatever you wish with Tox.

http://askubuntu.com/questions/423716/how-do-i-install-tox