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7 zip archiver.

7-Zip is a file archiver with a high compression ratio.
Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS7 zip.7-Zip is open source software. Most of the source code is under the GNU LGPL license. The AES code is under a BSD LICENSE. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.

Download 7-Zip 4.42 for Windows:

Link	Type	Windows	Size
Download	.exe	32-bit	818 KB
Download	.msi	x64	1238 KB

Download 7-Zip 4.56 beta for Windows:

Link	Type	Windows	Size
Download	.exe	32-bit	841 KB
Download	.msi	x64	1105 KB

compresses more than winzip or winrar.