Gizmo very closely mimics Skype. It offers free calling to other Gizmo users and very cheap calls to regular telephones. It’s available for Mac or Windows, with a Linux version coming soon. It isn’t quite as popular as Skype yet, but unlike Skype, Gizmo uses industry standard VoIP (Voice over IP) protocols so you can make free calls to non-Gizmo VoIP users.
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