skype

The service allows users to communicate with peers by voice, video, and instant messaging over the Internet. Phone calls may be placed to recipients on the traditional telephone networks. Calls to other users within the Skype service are free of charge, while calls to landline telephones and mobile phones are charged via a debit-based user account system. Skype has also become popular for its additional features, including file transfer, and videoconferencing. Competitors include SIP and H.323-based services, such as Empathy, Linphone, Ekiga ^[5] as well as the Google Talk service
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Gtalk

Voice chat

• Free long distance: make PC-to-PC calls to people anywhere in the world
• Audio conferencing: talk to multiple people at once
• Gmail integration: chat with your friends on Gmail

Text chat

• Instant messages: share quick thoughts in real time
• Status updates: see if friends are around and what they are up to

• File transfer: instantly send and receive files, pictures, and more

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