I need a VoIP software (light and easy to use) to do a conference with a group of friends.
Some of us have a webcam, some others don't.
Is there a software capable of displaying a video stream for each person with the webcam, so that we can see each other?

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Skype is one option:
http://www.skype.com/allfeatures/videocall/
Skype supports video chat and video conferencing.