Skype - The whole world can talk for free. --http://www.skype.com/
Our software’s quick and easy to get started with. Download, register, install, plug in your headset, speakers or USB phone and start calling your friends. The calls have excellent sound quality and are highly secure with end-to-end encryption. You don’t even need to configure your firewall or router or any other networking gear. It just, you know… works.
Discord --https://discordapp.com/
All-in-one voice and text chat for gamers that’s free, secure, and works on both your desktop and phone
Free Call --http://www.freecall.com/
Free phone calls with the FreeCall. Call your online friends for free as well as a special selection of popular international destinations.