Make a Free Call From PC

Hi guys, here I'm posting few sites by which you will be able to make call from your PC. No matter where you are from or where you are calling.

Few sites needs registration, and few sites are giving only trail. Just check them yourself

Here you go.
http://www.lowratevoip.com/en/index.html
https://www.tokiva.com/
http://www.youcall.com/
http://www.mobivox.com/