WinZip is a file archiver and compressor for Microsoft Windows, developed by WinZip Computing (formerly Nico Mak Computing). It natively uses PKWARE's PKZIP format but also has various levels of support for other archive formats. It is a proprietary product traditionally offering a time-limited evaluation version.
WinZip began life around the early 1990s as a shareware GUI front-end for PKZIP. Somewhere 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.
Since at least version 6.0 registered users could download newer versions of the software and enter their original registration information to obtain a free upgrade. This has ceased with version 10.0, although version 9.0 is still available for download from WinZip's web site.
WINRAR
WinRAR is a shareware file archiver and data compression utility by Eugene Roshal. Pocket RAR, a version of the file archiver for the Pocket PC platform, is available as freeware. It is one of the few applications that are able to create RAR archives natively, as the encoding method is held to be proprietary.
Complete support for RAR and ZIP archives, and unpacking of CAB, ARJ, LZH, TAR, GZ, ACE, UUE, BZ2, JAR, ISO, 7z and Z archives.
Optional archive encryption using AES (Advanced Encryption Standard) with a key of 128 bits.
Files and archives up to 8.589 billion (10^12) gigabytes in size are supported. The number of archived files is unlimited for all practical purposes.
The ability to create self-extracting and multi-volume (split) archives.
Data redundancy is provided via recovery records and recovery volumes, allowing to reconstruct even damaged archives.
WinRAR supports advanced NTFS file system options and Unicode in file names.
From version 3.50 beta 1, WinRAR adds support for interface skins and themes.
From version 3.50, WinRAR supports Windows 64x integration.
From version 3.51, a few security vulnerabilities and bugs are addressed.
From version 3.60 beta 1, WinRAR includes a multithreaded version of the compression algorithm, which improves compression speed on systems with dual-core or hyperthreading-enabled CPUs.
WinRAR can be tested for free for up to 40 days and provides free unlimited upgrades. After 40 days, every time you start WinRAR, a window will pop up, telling you to buy it, or continue using the software without buying (with the exception of the window popping up every time you start the program).