Skype is a proprietary peer-to-peer Voice over IP network founded by the entrepreneurs Niklas Zennström and Janus Friis, also founders of the file sharing application Kazaa. Skype is the leading VOIP-category product worldwide, with more than 23 million registered users, and more than 130,000 new users per day. The Skype code is closed source, and the protocol is not standardized but proprietary; this has raised suspicion and drawn some criticism from software developers and users. The Skype client's application programming interface (API) opens the network to software developers. The Skype API allows other programs to use the Skype network to get "white pages" information and manage calls.
The Windows user interface was developed in Pascal using Delphi, the Linux version is written in C++ with Qt, and the Mac OS X version is written in Objective-C with Cocoa. Parts of the client use Internet Direct, an open source socket communication library. Skype 2.0 for Mac is a little piece of software that lets you call anyone else using Skype, anywhere in the world, no matter what platform they use. Chat with up to 100 people or video conference call with a friend. Make video calls to anyone on Skype, no matter what kind of computer they are using Say hello, smile, or even wave with anyone, anywhere in the world on Skype. Great quality video that just works. Now Skype enabling high-quality voice calling via the Internet for multiple computer platforms.
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