Well skype was the first program in using VOIP technology using Internet like P2P it offers very nice long distance cost and allowing to send SMS to cell phones and Chat with millions of users.
SKYPE is not only nice and good things it uses every user computer as a SuperNODE using bandwidth and CPU resources of every user, it allows that accepting the contract. Even if you are behind a firewall Skype can get online and if a hacker and can enter Skype he can access that entire network.
Other programs to use VOIP is Yahoo messenger with voice
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