WinZip is a proprietary file archiver and compressor for Microsoft Windows, developed by WinZip Computing (formerly Nico Mak Computing). It natively uses the PKZIP format but also has various levels of support for other archive formats.WinZip was created in the early 1990s as a shareware GUI front-end for PKZIP. Sometime around 1996 the creators of WinZip incorporated compression code from the Info-ZIP project, thus eliminating the need for the PKZIP executable to be present.
From version 6.0 until version 9.0, registered users could download the newest versions of the software, enter their original registration information, and thereby obtain a free upgrade. As of version 10.0 this upgrade scheme was discontinued.[1] WinZip is available in standard and professional versions. However, the ability of Windows XP and Windows Vista to open .zip files (as "compressed folders") has reduced sales.
In May 2006, Corel Corporation, known for its WordPerfect and CorelDRAW product lines, announced that it has completed acquisition of WinZip Computing.[2]
WinZip has a 45-day free evaluation period. However, in some versions it continues to work even after this period of time.
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Winrar: - 
WinRAR (a.k.a. RAR) is a shareware file archiver and data compression utility developed by Eugene Roshal. It is one of the few applications that is able to create RAR archives natively, as the encoding method is held to be proprietary.
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Kazaa: -
KaZaA Lite is a hacked version of the original KaZaA Media Desktop that was created by users who were angered by the network's inclusion of secretly embedded spyware and adware in the software.It provides access to the same FastTrack network as the P2P program Kazaa Media Desktop, but does not require users to install any third-party software or view any banner ads.
KaZaA Lite contains absolutely no spyware, adware or other unwanted software, and the new K++ Edition even adds some cool extra functionality to the program:
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Skype: -
Skype is software that allows users to make telephone calls over the Internet. Calls to other users of the service are free of charge, while calls to landlines and cell phones can be made for a fee. Additional features include instant messaging, file transfer and video conferencing.
It was created by entrepreneurs Niklas Zennström, Janus Friis, and a team of software developers based in Tallinn, Estonia.[1] The Skype Group has its headquarters in Luxembourg, with offices in London, Tallinn, Tartu, Prague,[2] and San Jose, California.
Skype has experienced rapid growth in popular usage since the launch of its services. It was acquired by eBay in September 2005 for $2.6 billion.
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