- Skype
It’s free to download and free to call other people on Skype.
Skype the number one voice over ip software - loudtalks
LoudTalks is about voice communication without calls, instant messaging without typing. There are no typos, no calling, no busy signals. And, group communication with LoudTalks allows everyone to participate at their own pace, without interrupting normal activity. - yoomb
Yoomba, is an open communications experience that allows you to talk through your email, for free, globally. Yoomba works based on the first proprietary open peer2peer topology that sits on top of all email networks. This patent pending technology developed by Yoomba's team and can turns any email address into a phone and messenger. - Training on Voip
Voice over IP is a new technology. In order to be able to install the system successfully in client places, partners need to have a fundamental understanding about VOIP in general and about the pbxnsip product. - wikidot
Wikidot is a farm of Wiki Sites. Their mission is to provide free and professional wiki publishing, collaboration and communication solutions to anyone who needs it and wants it. - TagR
Mobile Social Network with Real Time Locations Based services, and Ambience Intelligence, VoiP, IM, Skype, Googletalk, Mapping, Flickr, Events, Calendaring, Scheduling, SecondLife Support
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