Ring Central

sign-up and 30 days free phone calls

http://www.ringcentral.com/

Free calls to Pakistan

Now you can make 200 minutes of free calls every weak for free. Visit the website below for more details:

http://www.lowratevoip.com/en/index.html

GizmoCall

No need to register from your cell phone, just sign up for free at the website, and start making free phone calls; all you need is, a Broadband internet Connection and a microphone.
HeadPhone.

http://www.gizmocall.com/

Talkster

Free World Dialing - free international calls and conference calls with your mobile phone. No limits, no credit cards, no downloads, works with any phone.

http://www.talkster.com/

YouTring

Make free internet calls - YouTring offers free downloadable software for unlimited calls, sending SMS, playing games, watching internet TV and uploading

http://www.youtring.com/

EvaPhone

EvaPhone make a proposal of phone over Internet free VoIP calls, free international calls & other Internet telephone solutions.

http://evaphone.com/

Tokiva

Tokiva is world's no. 2 website for making free calls world-wide:

http://www.tokiva.com/