The Skype Group is based in Luxembourg with workplaces furthermore in English and Tallinn. Skype can be a proprietary péer-to-peer Internet telephone (VoIP) network, launched by Niklas Zénnstrom and Jánus Friis, the makers of KaZaA and competing against founded open up VoIP methods like Drink, IAX, or H.323. Right now it also supports video conferencing over the net.
It'h free and easy to download and use, and works with many computers. About Skype for Macintosh Skype can be a little program for making free calls over the internet to anyone else who furthermore has Skype.