Free PC to PC phone calls

1]Skype

Skype is for calling other people on their computers or phones start calling for free all over the w orld.Additional features include instant messaging, file transfer and video conferencing.Skype is used in nearly all countries of the world, as it has been developed in view of delivering clear and consistent calls over the Internet.

2]Gizmo

Gizmo5 (formerly known as Gizmo Project) is the name ofa peer-to-peer network and of a proprietary freewaresoft phone for that network.Gizmo5 offers free calls from acomputer to the landline/mobile phones of other Gizmo users,but with restrictions that aren't fully disclosed.The Gizmo5software also has additional features that are unique to itself,such as interoperability with other systems/services via the SIP standard, built-in recording, and free voicemail.





3]Google Talk

Google Talk (GTalk) is a Windows and web-based application
for voice over internet protocol and instant messaging,
offered by Google.nstant messaging between the Google Talk
servers and its clients uses an open protocol, XMPP, allowing
users of other XMPP clients to communicate with Google Talk users.





4]Yahoo Messenger
Yahoo! Messenger is an instant messaging client and associated protocol provided by Yahoo!. Yahoo! Messenger is provided free of charge and can be downloaded and used with a generic "Yahoo! ID" which also allows access to other Yahoo! services, such as Yahoo! Mail, where users can be automatically notified when they receive new email. Yahoo! also offers PC-PC, PC-Phone and Phone-to-PC service, file transfers, webcam hosting, text messaging service, and chat rooms in various categories.



5]NetMeeting


Netmeeting is a conferencing client developed by Microsoft
that allows users to interact in real time over the internet.


NetMeeting delivers a complete Internet conferencing solution
for all Windows users with multi-point data conferencing,
text chat, whiteboard, and file transfer,
as well as point-to-point audio and video.