Viber for Mac OS X – comfortable stylish desktop VoIP-messenger with video- and audio-calls features and HD-conferences handling.
Skype is a proprietary peer-to-peer Internet telephony (VoIP) network, founded by Niklas Zennstrom and Janus Friis, the creators of KaZaA and competing against established open VoIP protocols like SIP, IAX, or H.323. Now it also supports video conferencing over the net. It's free and easy to download and use, and works with most computers. As a convenience, Apple allowed users to bring their Macs to a nearby Apple Store and use Apple’s WiFi to make the download. You must have OS X 10.6 Snow Leopard installed to purchase, download, or install Lion, and the 4 GB download could take some time with slower DSL connections (we don’t even want to think about how long it would take with dial-up). Lion was only available by purchase and download from the Mac App Store, where it retailed for US$29.99.
Some of these changes were to make it easier for iPhone, iPad, and iPod touch users to adapt to the Mac, some to make the two platforms work better together, and some to keep making the Mac better and better. OS X 10.7 Lion was released on Jand made some huge changes to the Mac.
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