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Skype
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Peer to peer internet voice service. Mac, Windows and Linux versions available. Users may call landlines and cellphones for a fee; users may call each other for free.
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Cliconnect Internet Telephony
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Offers a variety of domestic and international VoIP plans including unlimited calls to individual countries for fixed fee.
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SIPphone Inc.
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Peer-peer calling service. Requires SIP adaptor and phone.
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Lingo, Inc.
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Residential and business plans offering unlimited calls to U.S. and Canada using any phone with provided adapter. Plans available for unlimited calls to Europe, Asia, Mexico. Includes basic and advanced calling features, free fax line, and choice of local number portability or selecting from 220 U.S. area codes or 15 countries.
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